Railway Signaling | M

NOTE:

Although all of these digitized articles are 60 or more years old, and likely have minimal commercial value today, the reader should bear in mind that material dated after 1923 remains under copyright by Simmons-Boardman Publishing.

These articles and the information contained therein may be freely reproduced or used in printed or electronic form for non-commercial or educational purposes, provided the copyright holder and original author (if known) are acknowledged, and provided that such publication also refers readers to the original document on this site.

Simply making interesting material available to those who share my interest in the railway signal systems of the past has been my sole objective in this long project.

Learn more about this collection.

"MS" Tower, St. Louis, MO 1

1957	Consolidation cuts costs 1.1 MB

Machens, MO 1

1960	News briefs. 1960-09 756.9 KB

Mack Ave., Detroit, MI 1

1922	News of the Month. 1922-01 315.5 KB

Mackenzie, L. B. 1

1958	Six editors in 50 years 253.5 KB

Mackinaw Jct., IL 1

1911	Signaling on the Illinois Traction System 1.5 MB

Macksville, IL 1

1940	Pennsylvania Installs Centralized Traffic Control On 69 Miles of Line 13.1 MB

Macon Jct., GA 1

1945	Collision Entering CTC Line Due to Inadequate Signal 557.7 KB

Macon, GA 4

1965	News briefs. 1965-06 1.2 MB
1965	News briefs. 1965-07 788.3 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1959	Signaling moderate during '58 528.6 KB

Macon, MO 1

1959	Burlington installs modified CTC 1.0 MB

Madison, IL 1

1908	Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis 7.2 MB

Madison, OH 1

1955	News briefs. 1955-08 830.4 KB

Madison, WI 1

1913	New Block Signaling on the North-Western 1.8 MB

Madrid, IA 1

1959	Signaling moderate during '58 528.6 KB

Magee, IN 1

1961	News briefs. 1961-10 1.0 MB

magnetic stick relays 1

1947	Magnetic-Stick Relays 1.0 MB

Magnolia, NJ 1

1922	News of the Month. 1922-04 613.8 KB

Main St., Evanston, IL 1

1910	Main Street Tower on the Chicago & North Western at Evanston, IL 666.9 KB

main track derails 1

1921	Derails: Are They Good or Bad? 350.6 KB

Maine Central 7

1955	At Portland Terminal, combined interlocking 810.6 KB
1964	News briefs. 1964-08 811.5 KB
1958	One track does work of two on Maine Central 442.6 KB
1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB
1935	Preventing Unnecessary Operation of Highway-Railroad Crossing Signals 4.3 MB
1959	Signaling moderate during '58 528.6 KB
1935	The Railways' Answer to the Demand for Speed 2.8 MB

Maine Public Utility Commission 1

1951	Portland Terminal Solves Crossing Protection Problem 676.8 KB

Maine, AZ 8

1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-05 1.0 MB
1961	News briefs. 1961-06 725.8 KB
1964	News briefs. 1964-02 992.4 KB
1964	News briefs. 1964-04 1.3 MB
1964	News briefs. 1964-10 768.6 KB
1961	Santa Fe Signals New Main Line 913.2 KB
1960	Signaling enters automation 630.7 KB

maintainer call lights 1

1960	News briefs. 1960-08 603.8 KB

maintainers' quarters 2

1935	Maintainers' Tool Houses 3.5 MB
1935	Maintainers' Tool Houses 1.1 MB

maintenance 2

1937	Improving Signal Performance 2.1 MB
1925	Maintenance on C&NW Terminals 12.5 MB

maintenance of way 2

1960	How CTC affects D&H M/W work: Cuts costs 372.6 KB
1965	What's the Answer? 1965-07 629.7 KB

Malawi 1

1965	Rhodesia has 1215 miles of CTC 949.2 KB

Malmö, Sweden 1

1937	Railway Signaling by Wireless 1.6 MB

Malta, MT 1

1960	News briefs. 1960-07 845.4 KB

Malvern, AR 1

1958	MP consolidates CTC machines 797.2 KB

Mamaroneck, NY 1

1915	Extension of New Haven signals 684.8 KB

Manawaki Jct., Ontario 1

1915	Electric Train Staff Installation 3.3 MB

Manchester, England 1

1921	A Complete Train Despatching System 1.7 MB

Manchester, NH 2

1947	Choice of Interlocking Control Machines 266.5 KB
1951	CTC on Single Track Permits Removal of Second Main on 22.4 Miles on Boston & Maine 924.4 KB

Manchester, NY 1

1963	News briefs. 1963-05 720.2 KB

Mandan, ND 3

1922	News of the Month. 1922-04 613.8 KB
1922	News of the Month. 1922-05 426.4 KB
1922	News of the Month. 1922-12 388.1 KB

Manhattan Bridge, New York, NY 1

1916	AC Signaling in the Centre Street Loop 924.9 KB

Manhattan elevated 1

1909	Solenoid Signals 2.1 MB

Manhattan Jct., Toledo, OH 1

1922	News of the Month. 1922-12 388.1 KB

Manhattan Transfer, NJ 2

1922	News of the Month. 1922-01 315.5 KB
1933	Signaling Construction During 1932 632.3 KB

manipulation charts 2

1909	Willson's Gummed Paper Letters and Figures 170.0 KB
1909	Willson's Gummed Paper Letters and Figures 598.7 KB

Manito, IL 1

1950	OSing Device 1.4 MB

Manitoba Jct., MN 1

1911	Automatic Signals on the Northern Pacific 7.2 MB

Mankato, MN 1

1947	ICC Signal Hearings 179.7 KB

Manly, IA 1

1951	Automatic Block for Few Fast Trains 286.5 KB

Mansfield, OH 1

1918	Record Snowstorms Paralyze Transportation 424.7 KB

Manteno, IL 2

1922	News of the Month. 1922-08 394.0 KB
1922	News of the Month. 1922-09 562.2 KB

Mantua, OH 1

1936	Approach Electric Lighting On the Erie 2.7 MB

manual block 3

1957	Lehigh Valley has check-in, check-out 755.3 KB
1957	Letter to the editor: signal checking circuit used in the Netherlands 225.9 KB
1954	Train Operations When CTC Fails 2.0 MB

manual block remote control 2

1947	Annual Review and Outlook 425.1 KB
1957	More automation for signaling in 1957 1.2 MB

manual block signaling 38

1940	A Review of 1939 and a Glance Into 1940 1.6 MB
1947	Annual Review and Outlook 425.1 KB
1911	Automatic Signals on the Northern Pacific 6.3 MB
1923	Automatics on Paris Grande Ceinture 5.0 MB
1965	B&O would have used radio orders 565.5 KB
1957	Bessemer takes up second track and installs Centralized Traffic Control 706.4 KB
1942	Centralized Traffic Control on the Erie 464.3 KB
1922	Controlled Manual Block in Hauenstein Tunnel 3.4 MB
1924	Controlled Manual Block Signaling With Train Control 5.5 MB
1953	CTC Replaces Manual Block On Single Track 9.0 MB
1937	Ends of Double Track Controlled by CTC 12.4 MB
1909	First Annual Report of the Block Signal and Train Control Board to the Interstate Commerce Commission 4.0 MB
1944	Head-End Collision in Manual Block 874.3 KB
1944	ICC Annual Signaling Statistics 6.6 MB
1941	ICC Manual Block Regulations 518.5 KB
1947	ICC Signal Hearings 179.7 KB
1946	ICC Signaling Investigation 770.4 KB
1911	Letters to the Editor: Uniform Signaling: A reply to Mr. Rudd 1.8 MB
1949	Milwaukee Installs Automatic Block 8.2 MB
1947	New Interlocking at Bellevue, Ohio Protects Crossings of Four Railroads 997.9 KB
1950	New Rules, Standards and Instructions Issued by the Interstate Commerce Commission 7.9 MB
1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-10 1.8 MB
1964	News briefs. 1964-10 768.6 KB
1920	Non-Automatic Blocks and Accident Records 4.3 MB
1908	Reporting System of the Illinois Central Railroad 1.3 MB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1950	Rules, Standards and Instructions 1.5 MB
1937	Seaboard Utilizes Spring Switches 8.4 MB
1947	Signaling Order Issued by ICC 533.4 KB
1943	Signals Ordered on the Kansas City Southern 1.4 MB
1943	Some Benefits of the War 780.5 KB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1947	Territories Involved in the ICC Signaling Order 388.2 KB
1922	The Bryn Athyn Collision on the P&R 690.9 KB
1949	Train Operation By Signal Inidication Used Extensively on the Nickel Plate 6.1 MB
1940	Train Order Signals 4.2 MB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

manual gates 3

1947	Crossing Protection in Gary, Indiana 1.6 MB
1947	Highway Crossing Protection Installed by Several Railroads in Gary, IndianaR 1.2 MB
1961	News briefs. 1961-04 1.5 MB

manual interlocking 8

1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-03 1.1 MB
1962	News briefs. 1962-07 494.2 KB
1962	News briefs. 1962-10 461.7 KB
1963	News briefs. 1963-10 497.4 KB
1964	News briefs. 1964-05 1.0 MB
1964	News briefs. 1964-09 879.4 KB
1964	News briefs. 1964-10 768.6 KB

Manufacturers Railway 3

1929	Automatic Crossing Signals Used in Congested District 1.6 MB
1939	Interconnection of Train Signals and Crossing Protection 1.1 MB
1929	Secure New Ordinances for Changes in Crossing Protection 691.4 KB

Manville, NJ 1

1963	News briefs. 1963-01 951.3 KB

Margam, Wales 1

1960	British open new class yard 240.4 KB

Marion, IA 2

1951	More Signal Construction in 1950 1.0 MB
1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Marion, IL 1

1934	Accident at Crossing 491.3 KB

Marion, OH 1

1922	New Signaling on the Big Four 717.4 KB

Marion, VA 1

1950	Neon Lighting For Crossing Gate Arms 3.1 MB

Marionville, MO 1

1943	Accident Involves Signaling 1.0 MB

Mark, MO 1

1959	Burlington installs modified CTC 1.0 MB

marker lamps 1

1935	Use of Marker Lamps 1.0 MB

Markham Yard, IL 5

1949	A Mile-Stone In Signaling 1.2 MB
1926	Electro-Pneumatic Car Retarders in Service on Illinois Central 3.8 MB
1925	IC Markham contracts: News of the Month (June 1925) 579.3 KB
1950	IC Rebuilds Classification Yard 6.9 MB
1941	Illinois Central Uses Automatic Telephone System on Chicago Terminal Area 5.8 MB

Markham, IL 2

1943	Automatic Signaling Installed On the Wabash 5.3 MB
1951	More Signal Construction in 1950 1.0 MB

Marquardt 5

1964	Gate Control is by GCPs 1.4 MB
1965	GCPs can be used for various types of grade crossings 369.4 KB
1965	News briefs. 1965-01 2.0 MB
1965	News briefs. 1965-07 788.3 KB
1963	Theory and Operation of Grade Crossing Predictor is Explained 840.9 KB

Marquette, MN 1

1940	New Automatic Block Signaling on the Milwaukee 6.3 MB

Mars light 1

1965	Crossing protection gets new look 490.1 KB

Martelle, IA 1

1951	Single Track with CTC Replaces Double Track on Milwaukee 586.0 KB

Martindale, WA 1

1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

Martinez, CA 1

1935	Interlocking on Southern Pacific Suisun Bay Bridge 4.6 MB

Martins Creek Jct., PA 1

1909	Train staff on DL&W 1.1 MB

Maryhill, WA 1

1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

Maryland & Pennsylvania 3

1933	Double Filament Lamp With Dividing Screen Gives Burn-Out Indication 694.0 KB
1937	The Rotating Stop Sign 1.1 MB
1949	Varied Light Intensity 921.0 KB

Marysville, WA 1

1922	News of the Month. 1922-06 516.2 KB

Mason City, IA 1

1938	Highway Crossing Protection and Spring Switch on Milwaukee 3.2 MB

Mason City, IL 1

1939	Illinois Central Application Denied 854.7 KB

mass transit 1

1965	Transit vehicles set for automatic running 182.7 KB

Massac, KY 1

1930	Signal Indications Direct Trains on the Paducah & Illinois 5.0 MB

Massachusetts 1

1910	Interlocking Laws in the United States and Canada 821.1 KB

master transformer 1

1940	Coded Track Control 2.5 MB

Matewan, WV 3

1963	News briefs. 1963-10 497.4 KB
1964	News briefs. 1964-02 992.4 KB
1965	News briefs. 1965-01 2.0 MB

Matteson, IL 2

1941	Flashing Yellow as a Fourth Aspect on the IC 2.6 MB
1922	News of the Month. 1922-09 562.2 KB

Mattoon, IL 3

1929	Big Four Improves Operation by Remote Control 2.5 MB
1921	Educational Meetings On the Illinois Central 616.5 KB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Maxville, FL 1

1965	News briefs. 1965-10 1.1 MB

Maxwell, IA 1

1964	Milwaukee installs its first microwave 277.4 KB

May Street, St. Louis, MO 1

1941	All-Relay Signal System Installed on Terminal Railroad of St. Louis 1.2 MB

Mayfair, IL 2

1935	Safety of High Speed Trains 5.2 MB
1935	Signaling for Higher Train Speeds 3.0 MB

Maynard, IN 1

1952	Interlockings Modernized at Three Railroad Crossings 974.7 KB

Maynard, OH 1

1934	CTC Installed on the Baltimore & Ohio 2.1 MB

Mays Yard 1

1961	IC Puts CTC Through Swamp 1.6 MB

Mays Yard, LA 1

1954	IC Combines Interlockings 1.5 MB

Maywood, IL 1

1911	Automatic Signals on the Chicago Great Western 7.4 MB

Mazonia, IL 2

1929	C. & A. Modernizes Signaling Facilities 2.2 MB
1934	Centralized Traffic Control Installed on the Alton 1.7 MB

Mc Kees Rocks, PA 1

1955	CTC enables P&LE to remove fourth main track 515.3 KB

McAdam Jct., New Brunswick 1

1915	Electric Train Staff Installation 3.3 MB

McArthur Jct., Manitoba 1

1958	Nine layouts in one interlocking 1.7 MB

McCammon, ID 1

1955	News briefs. 1955-08 830.4 KB

McClenny, FL 1

1964	News briefs. 1964-08 811.5 KB

McComb, MS 1

1947	Illinois Central Honors Radio “Hams” for Emergency Services 278.0 KB

McCook, NE 3

1947	Burlington Concentrates CTC Control at Division Headquarters 840.8 KB
1946	New Signal Control Line Circuits in Centralized Traffic Control Territory on the Burlington 2.8 MB
1925	Train Operation by Signal Indication on Burlington for 14 Years 679.2 KB

McCracken, KS 1

1938	Adapting Signaling to Requirements 1.7 MB

McDoel, IN 1

1942	Chicago, Indianapolis & Louisiville Modernizes Automatic Signaling 3.9 MB

McElhany, MO 2

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1943	Signals Ordered on the Kansas City Southern 1.4 MB

McFarland, KS 1

1946	Rock Island Uses Carrier Equipment for Automatic OS Reports 3.9 MB

McGehee, AR 2

1960	News briefs. 1960-07 845.4 KB
1964	News briefs. 1964-08 811.5 KB

McKees Rocks, PA 3

1963	Interlocking: New Solid State Devices Save Money 2.1 MB
1959	P&LE installs multiple track CTC 1.1 MB
1951	P&LE Rebuilds Interlocking 957.2 KB

McKeesport, PA 4

1935	Centralized Traffic Control Installed on the Pittsburgh & Lake Erie 12.9 MB
1959	P&LE installs multiple track CTC 1.1 MB
1951	P&LE Rebuilds Interlocking 957.2 KB
1944	Signaling Modernized On the Pittsburgh & Lake Erie 4.7 MB

McKenzie & Holland 1

1922	News of the Month. 1922-11 361.5 KB

McKenzie, WV 2

1961	News briefs. 1961-07 648.9 KB
1965	News briefs. 1965-07 788.3 KB

McKinley Bridge, St. Louis, MO 1

1956	Crossing Protection In Industrial Area 3.1 MB

McKnight, Robert W. 1

1958	Six editors in 50 years 253.5 KB

Meads, SC 1

1963	News briefs. 1963-04 896.6 KB

Meadville Jct., PA 2

1957	Bessemer takes up second track and installs Centralized Traffic Control 706.4 KB
1943	CTC on the Bessemer & Lake Erie 8.7 MB

Meadville, PA 1

1929	Erie Equips Complete Division with Signals and Interlockers 3.9 MB

mechanical color light signals 1

1935	Mechanical Color Light Signals in England 1.3 MB

mechanical interlocking 88

1915	A Half-Interlocking Plant on the Canadian Northern 1.6 MB
1921	A New Idea in Traffic Locking On the C&O 1.7 MB
1943	All-Relay Interlocking Replaces Mechanical Plant 9.3 MB
1947	All-Relay Interlockings On the RF&P 1.3 MB
1947	Annual Review and Outlook 425.1 KB
1911	Automatic Signals on the Northern Pacific 6.3 MB
1951	B&O Installs Modern Interlocking 871.3 KB
1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1943	Canadian National Installs a Large All-Relay Electric Interlocking 8.8 MB
1944	Canadian Pacific Installs Automatic Block Signaling 6.8 MB
1947	Choice of Interlocking Control Machines 266.5 KB
1958	CN consolidates interlockings 2.1 MB
1915	Compensation of Pipe Lines 319.6 KB
1958	CP consolidates interlockings 2.0 MB
1955	CTC and cab signaling on Union Pacific 789.5 KB
1955	CTC enables P&LE to remove fourth main track 515.3 KB
1954	CTC Improves Train Operation 3.3 MB
1955	CTC on single and double track 406.8 KB
1935	Depression Operation of Interlocking 2.6 MB
1935	Disposition of Mechanical Interlocking Equipment 1.3 MB
1915	Duluth Terminal Trestle Signaling 2.3 MB
1937	Gages for Mechanical Locking 2.4 MB
1911	General News (August 1911) 557.3 KB
1955	How CN increased track capacity 516.4 KB
1939	Illinois Central Application Denied 854.7 KB
1908	Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis 7.2 MB
1952	Interlockings Modernized at Three Railroad Crossings 974.7 KB
1915	Jersey City Terminal Interlocking 1.1 MB
1957	Lehigh Valley combines interlockings 404.0 KB
1936	Lost Motion in Locking 3.0 MB
1918	Maintaining an Interlocking Plant at High Tide 241.8 KB
1917	Maintenance of Mechanical Interlocking 595.4 KB
1910	Mechanical Interlocking at State Line 1.0 MB
1935	Mechanical Plant Replaced by Electric Interlocking 7.2 MB
1918	Mechanical Signaling 222.3 KB
1916	Method for Checking Mechanical Locking 322.8 KB
1965	Midwest RRs fight the weather 914.4 KB
1944	Military Railway Service in Italy Installs Electric Interlocking 5.6 MB
1951	More Signal Construction in 1950 1.0 MB
1964	MP interlocking uses solid-state control system 410.9 KB
1944	New All-Relay Interlocking at Providence, RI on the New Haven 5.8 MB
1922	New Interlocking on the CRR of NJ 734.1 KB
1918	New Mechanical Plant on Chicago & Alton 702.8 KB
1950	New Rules, Standards and Instructions Issued by the Interstate Commerce Commission 7.9 MB
1958	News briefs. 1958-01 1.8 MB
1959	News briefs. 1959-05 506.5 KB
1960	News briefs. 1960-02 995.4 KB
1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-06 1.2 MB
1961	News briefs. 1961-04 1.5 MB
1961	News briefs. 1961-10 1.0 MB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-04 1.2 MB
1962	News briefs. 1962-06 989.1 KB
1962	News briefs. 1962-11 468.1 KB
1963	News briefs. 1963-01 951.3 KB
1963	News briefs. 1963-03 790.6 KB
1963	News briefs. 1963-05 720.2 KB
1963	News briefs. 1963-06 961.3 KB
1963	News briefs. 1963-12 429.2 KB
1964	News briefs. 1964-06 812.0 KB
1964	News briefs. 1964-07 833.0 KB
1965	News briefs. 1965-09 381.8 KB
1965	News briefs. 1965-10 1.1 MB
1965	News briefs. 1965-11 1.2 MB
1922	News of the Month. 1922-01 315.5 KB
1922	News of the Month. 1922-02 323.2 KB
1922	News of the Month. 1922-04 613.8 KB
1922	News of the Month. 1922-06 516.2 KB
1922	News of the Month. 1922-07 360.7 KB
1922	News of the Month. 1922-08 394.0 KB
1922	News of the Month. 1922-12 388.1 KB
1959	P&LE installs multiple track CTC 1.1 MB
1943	Railway Signaling in North Africa 3.5 MB
1910	Reconstruction of Burnside Interlocking 863.7 KB
1947	Relay Interlocking on Lehigh Valley 805.7 KB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1950	Rules, Standards and Instructions 1.5 MB
1959	Santa Fe CTCs double track line 2.2 MB
1960	Short track circuit causes accident 436.0 KB
1933	Signaling Construction During 1932 632.3 KB
1965	Signalmen's President Jesse Clark discusses safety on the railroads 648.8 KB
1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB
1911	Standard Outline Bill of Mechanical Material 8.7 MB
1915	Switch and Lock Movements in Mechanical Plants 2.0 MB
1911	The Mechanics of the Compensator 1.8 MB
1955	The Reading has compact control machine for consolidated interlocking 511.5 KB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

mechanical leadout 1

1915	Compensation of Pipe Lines 319.6 KB

mechanical locking 2

1936	Cleaning Mechanical Locking Bars 1.5 MB
1937	Gages for Mechanical Locking 2.4 MB

mechanical semaphores 1

1957	What's the answer: Slotting relay? 361.2 KB

mechanical signals 1

1935	Mechanical Color Light Signals in England 1.3 MB

mechanical treadles 1

1965	Rhodesia has 1215 miles of CTC 949.2 KB

mechanical tripstop 1

1933	New Train Stop System Developed in Germany 399.3 KB

Mechanicsville, NY 2

1947	Hoosac Tunnel Interlocking and CTC 1.7 MB
1922	News of the Month. 1922-09 562.2 KB

Mechanicville, NY 3

1947	Choice of Interlocking Control Machines 266.5 KB
1955	CTC reduces operating expenses 431.8 KB
1962	News briefs. 1962-03 1.1 MB

Medill, MO 3

1960	News briefs. 1960-03 1.9 MB
1922	News of the Month. 1922-09 562.2 KB
1922	Signal Construction on the Santa Fe 797.6 KB

Melbourne, Australia 1

1939	Phantom Indications in Color-Light Signals 2.2 MB

Melbourne, Victoria, Australia 1

1922	Single Track Signaling in Australia 527.7 KB

Melia, NE 1

1955	CTC on single and double track 406.8 KB

Melrose Park, IL 1

1964	News briefs. 1964-06 812.0 KB

Melrose, NM 1

1945	CTC West of the Pecos On the Santa Fe 4.6 MB

Melvern, KS 3

1922	News of the Month. 1922-09 562.2 KB
1959	Santa Fe CTCs double track line 2.2 MB
1922	Signal Construction on the Santa Fe 797.6 KB

Melville Manitoba 1

1965	News briefs. 1965-10 1.1 MB

Melville, Saskatchewan 2

1961	News briefs. 1961-02 1.4 MB
1962	News briefs. 1962-01 986.8 KB

Memphis Union Station 1

1950	SS Protection 2.1 MB

Memphis, TN 4

1915	Electric Interlocking at Aulon, Tennessee 882.6 KB
1952	Illinois Central Installs Modern Protection at Crossings in Memphis, TN 1.3 MB
1960	News briefs. 1960-05 1.0 MB
1955	What CTC did for the Dixie Line 889.8 KB

Mena, AR 1

1955	CTC moves trains on grades 762.8 KB

Mendota, IL 4

1925	CB&Q Controls Switches Remotely 3.7 MB
1962	News briefs. 1962-04 1.2 MB
1964	News briefs. 1964-07 833.0 KB
1958	RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB

Mendoza, Argentina 1

1960	News briefs. 1960-06 1.2 MB

Menoken, KS 1

1937	Remote Control Switch Expedites Trains at a Junction on the Union Pacific 5.1 MB

Merrit, WA 1

1964	News briefs. 1964-04 1.3 MB

Merritt, WA 3

1964	News briefs. 1964-02 992.4 KB
1964	News briefs. 1964-10 768.6 KB
1965	News briefs. 1965-09 381.8 KB

Mershon Jct., MI 1

1965	News briefs. 1965-12 609.3 KB

message duplication 1

1960	"Dry" message duplication saves money 234.7 KB

Metropolis, IL 2

1960	News briefs. 1960-09 756.9 KB
1930	Signal Indications Direct Trains on the Paducah & Illinois 5.0 MB

Metropolitan Transit Authority (Boston) 2

1960	News briefs. 1960-09 756.9 KB
1960	Signal construction steady in 1959 385.2 KB

Metropolitan West Side Elevated 1

1911	A Summary of Signaling Practice 3.6 MB

Miami, FL 1

1947	Annual Review and Outlook 425.1 KB

Miamisburg, OH 1

1965	News briefs. 1965-01 2.0 MB

Michigan 3

1911	A Comparison of the Interlocking Laws of the Various States 2.6 MB
1910	Interlocking Laws in the United States and Canada 821.1 KB
1960	News briefs. 1960-08 603.8 KB

Michigan Central 38

1936	Accident in Automatic Block Signal Territory 4.7 MB
1921	Accident on Porter, Indiana Interlocking Plant 1.1 MB
1927	Additional Solutions to Call-On Signal Circuit Problem 2.8 MB
1914	All Electric Interlocking at Joliet 1.5 MB
1937	Barriers on the Michigan Central 7.0 MB
1939	Controlling Four-Aspect Automatics 1.6 MB
1936	Crossing Protection Includes Signals for Directing Trains 17.0 MB
1910	Electric Interlocking at Griffith, Indiana 964.1 KB
1936	Flashing Lights At 20 Crossings In Kalamazoo 8.9 MB
1933	Four-Position Dwarfs 1.5 MB
1947	Highway Crossing Protection Installed by Several Railroads in Gary, IndianaR 1.2 MB
1939	ICC Permits Removal of Derails 1.1 MB
1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1939	Interconnection of Train Signals and Crossing Protection 1.1 MB
1937	J. C. Mock Retires 1.4 MB
1931	Michigan Central Makes Extensive Improvements in Signaling System 3.3 MB
1927	Michigan Central Train Control Approved 800.8 KB
1957	More automation for signaling in 1957 1.2 MB
1940	New Interlockings at Windsor, Ont. On the Michigan Central 14.1 MB
1935	New York Central Extends South Bend Interlocking 6.0 MB
1925	News of the Month (July 1925) 680.1 KB
1922	News of the Month. 1922-03 314.9 KB
1922	News of the Month. 1922-09 562.2 KB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB
1918	Rear End Collision on the Michigan Central 471.2 KB
1936	Reducing Current at Flashing Relay Contacts 2.2 MB
1953	Remote Control Interlockings Improve Terminal Operation 551.4 KB
1938	Remote Control on the Michigan Central 3.9 MB
1937	Route Control Interlocking – A New Signaling Development 2.9 MB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1929	Simplified Electric Interlocking Plant on Michigan Central.pdf 3.6 MB
1924	Study of Train Control on the Michigan Central 2.1 MB
1925	The Train Control Situation 853.0 KB
1941	Track Model Lamps 429.7 KB
1926	Train Control Progress in 1925 3.1 MB
1940	Train Order Signals 4.2 MB
1946	War-Time Replacement of Interlocking on Pere Marquette 3.4 MB
1929	What Kind of Control for Take-Siding Signals? 512.5 KB

Michigan City, IN 5

1927	Chicago South Shore & South Bend Changes Signal Equipment 2.6 MB
1962	News briefs. 1962-07 494.2 KB
1963	News briefs. 1963-04 896.6 KB
1922	News of the Month. 1922-10 368.4 KB
1928	South Shore Line Uses Spring Switches on Heavy Traffic Lines 1.4 MB

Michoud, LA 1

1959	Pushbutton console for CTC 785.3 KB

microwave 3

1964	Milwaukee installs its first microwave 277.4 KB
1963	News briefs. 1963-01 951.3 KB
1958	RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB

microwave communication 2

1950	Microwaves on Railroads 1.3 MB
1960	Signaling enters automation 630.7 KB

Middletown, CT 1

1909	Train staff installation on the NYNH&H 1.0 MB

Middletown, PA 1

1961	News briefs. 1961-12 978.0 KB

Midland City, OH 2

1937	APB, Remote Control, and CTC on the Baltimore & Ohio 11.9 MB
1962	News briefs. 1962-04 1.2 MB

Midland of Manitoba 1

1937	Switch Indicators Serve as Interlocking Control Devices 5.6 MB

Midland Railway (Great Britain) 3

1919	Block Signaling Practice on a British Railway (Part 1) 299.0 KB
1919	Block Signaling Practice on a British Railway (Part 2) 484.7 KB
1919	Block Signaling Practice on a British Railway (Part 3) 337.3 KB

Midvale, UT 2

1949	An Unusual Automatic Plant 4.5 MB
1937	CTC On the Denver & Rio Grande Western 8.0 MB

Mildred, FL 1

1963	News briefs. 1963-11 1.4 MB

Military Railway Service 2

1944	Military Railway Service in Italy Installs Electric Interlocking 5.6 MB
1943	Railway Signaling in North Africa 3.5 MB

Mill Creek, IL 1

1948	CTC Big Help to GM&O 1.7 MB

Mill River, CT 1

1956	New Haven Consolidates Control of Nine Interlocking Layouts 8.3 MB

Millbrook, OH 1

1925	PRR construction (Lima, et al): News of the Month (July 1925) 675.8 KB

Millburn, NJ 1

1925	Multiple Track Operation by Signal Indication 2.7 MB

Miller Train Control 1

1922	Automatic Train Control in Use On American Railroads 353.7 KB

Miller, WV 2

1962	News briefs. 1962-06 989.1 KB
1965	News briefs. 1965-07 788.3 KB

Milton, WV 1

1921	A New Idea in Traffic Locking On the C&O 1.7 MB

Milwaukee, WI 11

1960	"Dry" message duplication saves money 234.7 KB
1954	Automatic Gates Increase Safety 3.2 MB
1958	Crossing protection program saves 59% 553.4 KB
1926	Electric Plant Replaces Three Mechanical Interlockings 3.0 MB
1947	ICC Signal Hearings 179.7 KB
1917	New Interlocking Plant in Milwaukee 1.2 MB
1935	New Signaling on the Route of the C&NW "400" 9.6 MB
1963	News briefs. 1963-12 429.2 KB
1935	Safety of High Speed Trains 5.2 MB
1935	Signaling for Higher Train Speeds 3.0 MB
1935	The "400" to Run on Six and One Half Hour Schedule 942.0 KB

Mineola, NY 1

1952	Speed Control Installed on the Long Island 1.3 MB

Miner, WI 2

1935	Safety of High Speed Trains 5.2 MB
1935	Signaling for Higher Train Speeds 3.0 MB

Minford, OH 1

1950	Remote Control of Center Sidings On Busy Double-Track Line 3.6 MB

miniature signal system 1

1932	Miniature Signal System a Hobby 606.4 KB

Minier, IL 1

1934	Crossing Gate With Light Signals Installed at Railroad Crossing 1.0 MB

Minneapolis & St. Louis 7

1960	Fourteen RRs adopt new operating code 945.4 KB
1935	Accident at Automatic Plant 4.5 MB
1928	Automatic Interlockers Are Profitable Investments 3.3 MB
1939	CTC and Automatic Signals on the Rock Island 6.6 MB
1963	News briefs. 1963-11 1.4 MB
1959	Signaling: 1960 225.2 KB
1932	Smashboard Mechanisms 1.7 MB

Minneapolis, MN 11

1929	Crossing Protection Installed Extensively on the Milwaukee 1.3 MB
1943	Crossing Protection on Milwaukee 5.7 MB
1958	Crossing protection program saves 59% 553.4 KB
1928	GN Replaces Semaphores with Color Light Signals 1.2 MB
1955	How the Great Northern reduces accidents at highway crossings 425.6 KB
1965	Midwest RRs fight the weather 914.4 KB
1935	New Signaling on the Route of the C&NW "400" 9.6 MB
1963	News briefs. 1963-10 497.4 KB
1964	News briefs. 1964-07 833.0 KB
1924	NP Interlocking in Minneapolis 2.3 MB
1935	Safety of High Speed Trains 5.2 MB

Minneapolis, Northfield & Southern 1

1960	Fourteen RRs adopt new operating code 945.4 KB

Minneapolis, St. Paul & Sault Ste. Marie 15

1949	192 Miles of Automatic Block On Soo Line 6.0 MB
1950	Bootleg Risers and Bonds 2.1 MB
1953	Call-On Signals 354.5 KB
1948	Gates at Three Crossings on Soo Line 1.8 MB
1911	General News (August 1911) 557.3 KB
1947	ICC Signal Hearings 179.7 KB
1922	News of the Month. 1922-09 562.2 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1955	Remote Control Eliminates Train Stops 1.3 MB
1941	Remote Control Installation 2.4 MB
1933	Remote Control on Soo Line 2.7 MB
1952	Soo Line Completes Signaling on 260 Miles of Single Track 737.7 KB
1950	Spring Switch Signaling 2.5 MB
1947	Territories Involved in the ICC Signaling Order 388.2 KB
1960	What’s the answer? Automatic OS 354.1 KB

Minnesota Transfer 1

1960	Fourteen RRs adopt new operating code 945.4 KB

Minot, ND 5

1947	ICC Holds Signal Hearing 507.5 KB
1961	News briefs. 1961-07 648.9 KB
1962	News briefs. 1962-01 986.8 KB
1963	News briefs. 1963-06 961.3 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Minturn, CO 1

1929	D&RGW Expedites Trains With Centralized Control 2.1 MB

Mirfield, England 1

1932	Speed Signaling in England 1.9 MB

Missabe, MN 1

1959	Pushbutton console for CTC 785.3 KB

Mission Tower, Los Angeles, CA 1

1939	Mission Tower Interlocking at Los Angeles 9.2 MB

Mississippi Central 1

1962	News briefs. 1962-04 1.2 MB

Mississippi River 2

1916	Government Drawbridge Signaling 670.2 KB
1965	Midwest RRs fight the weather 914.4 KB

Mississippi River bridge, New Orleans, LA 2

1937	Interlocking and Signaling For New Bridge at New Orleans 5.9 MB
1936	New Electric Interlocking and Signaling at the Mississippi River Bridge at New Orleans 7.9 MB

Mississippi River floods 1

1965	Midwest RRs fight the weather 914.4 KB

Missoula, MT 6

1911	Automatic Signals on the Northern Pacific 7.2 MB
1961	News briefs. 1961-07 648.9 KB
1964	News briefs. 1964-02 992.4 KB
1965	News briefs. 1965-01 2.0 MB
1965	News briefs. 1965-07 788.3 KB
1965	News briefs. 1965-08 749.4 KB

Missouri & Illinois 1

1956	Centralia Has Protection of All Crossings 6.7 MB

Missouri Pacific 134

1940	"Running" Passing Tracks 1.1 MB
1933	A New Deal on Train Control 639.0 KB
1934	Accident at Crossing 491.3 KB
1936	Accuracy of Timing Relays 2.2 MB
1938	Adapting Signaling to Requirements 1.7 MB
1931	Another Unique Interlocker on the Rock Island 1.4 MB
1937	APB Circuits 1.1 MB
1930	Approach-Lighting a Leaving Signal 1.0 MB
1928	Arrangement of Color Light Units 816.2 KB
1934	Automatic Interlockings on the Santa Fe 2.2 MB
1929	Batting Averages for Signal Maintainers on MP 477.0 KB
1941	Centralized Traffic Control Installed on the Missouri Pacific 3.7 MB
1938	Clearing of Signals at Automatic Interlockings 2.2 MB
1956	Conelrad – A Civil Defense Measure … How Some Railroads are Participating 4.1 MB
1928	Continued Activity and Development in Signaling 1.1 MB
1924	Controlled Manual Block Signaling With Train Control 5.5 MB
1935	Crossing Bells at Flasher Signals 1.9 MB
1954	CTC Increases Capacity of Double Track 4.2 MB
1955	CTC on single and double track 406.8 KB
1938	CTC on the Missouri Pacific 5.3 MB
1931	CTC Without Power-Operated Switches 1.8 MB
1936	Demands for Modern Signaling 12.1 MB
1935	Disposition of Mechanical Interlocking Equipment 1.3 MB
1936	Double-Caution Signaling 3.4 MB
1939	Drag Detectors Protect Bridges 3.2 MB
1933	Economics of Modern Signaling 2.1 MB
1962	Electric Switch Lamp Lighting Helps Reduce Operating Expense 661.7 KB
1949	Entrance-Exit Interlocking Installed on Missouri Pacific 3.0 MB
1935	Facing Point Locks on Switches 3.2 MB
1935	Flashing Aspects 1.3 MB
1965	GCPs can be used for various types of grade crossings 369.4 KB
1945	History, Development, and Application of Track Motor Cars 3.5 MB
1946	ICC 50-MPH Signal Hearing 6.9 MB
1922	ICC Proposes to Order Train Control on 49 Roads 376.4 KB
1943	Junction and Crossing Included in Centralized Traffic Control On the Missouri Pacific 4.7 MB
1936	Lights Interfere With View of Signals 2.3 MB
1936	Location of Home Signals at Automatic Interlockings 3.0 MB
1965	Merging divisions require changing circuits 335.5 KB
1931	Missouri Pacific Installs Centralized Traffic Control on 32 Miles of Double Track 2.7 MB
1927	Missouri Pacific Operates Train in Either Direction on Both Tracks 1.8 MB
1957	More automation for signaling in 1957 1.2 MB
1958	MP consolidates CTC machines 797.2 KB
1964	MP interlocking uses solid-state control system 410.9 KB
1955	Much is new in signaling for 1955 826.7 KB
1954	New Orleans Passenger Terminal 4.7 MB
1948	New Signaling In Texas on Missouri Pacific Lines 1.8 MB
1956	New Three-Track Interchange Includes Interlocking and Talk-Backs 8.9 MB
1955	News briefs. 1955-08 830.4 KB
1960	News briefs. 1960-01 1.1 MB
1960	News briefs. 1960-02 995.4 KB
1960	News briefs. 1960-07 845.4 KB
1961	News briefs. 1961-01 761.9 KB
1961	News briefs. 1961-05 1.1 MB
1961	News briefs. 1961-10 1.0 MB
1962	News briefs. 1962-02 1.4 MB
1962	News briefs. 1962-03 1.1 MB
1962	News briefs. 1962-06 989.1 KB
1962	News briefs. 1962-07 494.2 KB
1962	News briefs. 1962-09 838.3 KB
1963	News briefs. 1963-01 951.3 KB
1963	News briefs. 1963-08 1.2 MB
1963	News briefs. 1963-11 1.4 MB
1964	News briefs. 1964-04 1.3 MB
1964	News briefs. 1964-06 812.0 KB
1964	News briefs. 1964-07 833.0 KB
1964	News briefs. 1964-08 811.5 KB
1964	News briefs. 1964-09 879.4 KB
1965	News briefs. 1965-01 2.0 MB
1965	News briefs. 1965-07 788.3 KB
1965	News briefs. 1965-10 1.1 MB
1922	News of the Month. 1922-01 315.5 KB
1922	News of the Month. 1922-02 323.2 KB
1922	News of the Month. 1922-04 613.8 KB
1922	News of the Month. 1922-08 394.0 KB
1922	News of the Month. 1922-09 562.2 KB
1922	News of the Month. 1922-12 388.1 KB
1941	Non-Stop Permissive Signals 1.4 MB
1956	NX Control Replaces Lever Machine 2.8 MB
1939	Operation by Signal Indication on Single Track 846.7 KB
1941	P. M. Gault obituary 1.2 MB
1931	Point Detector or Switch Circuit Controller for CTC Switches? 835.1 KB
1931	Precision-Base Lamps 1.4 MB
1940	Proceeding By a Head-Block Signal 1.9 MB
1931	Protecting CTC Switches 2.9 MB
1937	Railroad Grade Crossing Gates 2.2 MB
1922	Railroads Argue Against Automatic Stops at ICC Hearing 436.8 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB
1937	Replacement and Life of Lamps 3.0 MB
1930	Report of Committee I – Economics of Signaling 2.5 MB
1940	Route Type Interlocking at Tower Grove in St. Louis 11.1 MB
1958	RS&C 50th anniversary: Signaling ... manual to automatic 2.0 MB
1959	Santa Fe CTCs double track line 2.2 MB
1937	Selection of Routes at Automatic Interlockings 1.4 MB
1926	Signal Business Is Good Especially For Single Track 382.3 KB
1960	Signal construction steady in 1959 385.2 KB
1949	Signal Indications to Stop Trains When Dragging Equipment Detectors Operate 922.0 KB
1933	Signal or Rule? 1.1 MB
1937	Signaling at Lap Sidings 1.1 MB
1935	Signaling in Dust Storms 2.3 MB
1959	Signaling moderate during '58 528.6 KB
1934	Signals at Automatic Interlockers 378.1 KB
1927	Signals Eliminate Written Train Orders 512.8 KB
1940	Single-Track Signaling 2.5 MB
1932	Smashboard Mechanisms 1.7 MB
1943	Some Benefits of the War 780.5 KB
1939	Special Aspects for Detectors 937.0 KB
1939	Speeding Up Train Operation With Signaling 4.5 MB
1944	St. Louis Southwestern Installs Centralized Traffic Control 6.9 MB
1950	Stopping Distance on Grades 3.5 MB
1957	Survey shows progress in signal education 330.6 KB
1961	Survey Tells How Railroads Use Hotbox Detectors 1.8 MB
1937	Switch Protection in Automatic Territory 3.0 MB
1945	Teaching the Meaning of Signal Aspects 431.7 KB
1947	Territories Involved in the ICC Signaling Order 388.2 KB
1936	Testing New Interlocking 1.7 MB
1932	Testing OS Track Circuits 926.0 KB
1926	The Direction of Train Movements by Signal Indication Without Written Train Orders 829.5 KB
1925	The Train Control Situation 853.0 KB
1930	Time-Table Schedules and Signal Indications 1.1 MB
1923	Traffic Studies Show Need of Balanced Budgets 5.3 MB
1926	Train Control Progress in 1925 3.1 MB
1927	Train Operation Without Written Train Orders 3.3 MB
1954	Train Operations When CTC Fails 2.0 MB
1956	Train Operations When CTC Fails 3.5 MB
1923	Train-Order Signals at Interlockers 3.6 MB
1950	Two Single Tracks, Side By Side 1.4 MB
1937	Types of Crossing Signals Installed 1.1 MB
1939	Unusual Signal Trouble 1.6 MB
1950	Unusual Trouble 3.0 MB
1936	What Is the Capacity of a Single-Track Line? 2.0 MB
1920	What Scheme of Signaling is Most Desirable? 6.8 MB
1958	What's the answer? Approach lighting 237.1 KB
1957	Why Cotton Belt installed CTC on entire main line 914.0 KB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Missouri Valley, IA 3

1945	ICC Calls For Switch Locks 1.5 MB
1965	News briefs. 1965-08 749.4 KB
1925	Preliminary Report on C&NW Train Control 929.6 KB

Missouri-Kansas-Texas 33

1911	A Summary of Signaling Practice 3.6 MB
1938	AC Primary on the Katy 442.5 KB
1936	Accuracy of Timing Relays 2.2 MB
1935	Avoiding Light-Out Signal Failures 1.2 MB
1928	Cost of a Train Stop 944.9 KB
1950	Flood Detectors on the Katy 2.7 MB
1937	Illumination as a Type of Crossing Protection 3.0 MB
1943	Lap Order Results in an Accident 818.6 KB
1930	Light-out Protection 1.1 MB
1925	Marker Lights on Single Track Automatic Signals 684.0 KB
1949	New Automatic Block on the Katy 4.7 MB
1956	New Three-Track Interchange Includes Interlocking and Talk-Backs 8.9 MB
1961	News briefs. 1961-10 1.0 MB
1962	News briefs. 1962-07 494.2 KB
1964	News briefs. 1964-06 812.0 KB
1964	News briefs. 1964-07 833.0 KB
1922	News of the Month. 1922-01 315.5 KB
1922	News of the Month. 1922-10 368.4 KB
1922	News of the Month. 1922-12 388.1 KB
1933	Preventing Lamp Failures 1.2 MB
1935	Preventing Unnecessary Operation of Highway-Railroad Crossing Signals 4.3 MB
1936	Reconstruction of Interlocking at the Dallas Union Terminal 14.8 MB
1937	Replacement and Life of Lamps 3.0 MB
1927	Should Motor Car Operators Watch Signals More Carefully 1.2 MB
1928	Signal and Train Control Hearing Ends 2.0 MB
1935	Signaling in Dust Storms 2.3 MB
1937	Switch Protection in Automatic Territory 3.0 MB
1947	Territories Involved in the ICC Signaling Order 388.2 KB
1927	Train Operation Without Written Train Orders 3.3 MB
1928	What Is the Cost of a Train Stop? 463.2 KB
1965	What's the answer? 1965-12 261.7 KB
1928	Why Markers for Automatic Signals? 494.6 KB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Mitchell, SD 1

1964	Milwaukee installs its first microwave 277.4 KB

Mitchell, V. S. 3

1965	Crossing protection gets new look 490.1 KB
1958	Crossing protection program saves 59% 553.4 KB
1965	Midwest RRs fight the weather 914.4 KB

Moberly, MO 2

1945	Manual Block-Remote Control Developed On the Wabash 5.7 MB
1951	Wabash Installs Yard Communication System 1.2 MB

Mobile & Ohio 3

1934	Automatic Plant Replaces Mechanical Interlocking on Alton & Southern 1.2 MB
1928	Color Light Train Order Signals Are Effective 2.9 MB
1915	Electric Interlocking at Davis, Illinois 241.3 KB

mobile laboratory 1

1959	Mobile lab evaluates class yards 830.6 KB

Mobile, AL 7

1944	L&N Installs CTC On an Engine District 9.0 MB
1962	News briefs. 1962-05 826.8 KB
1965	News briefs. 1965-05 1.4 MB
1965	News briefs. 1965-09 381.8 KB
1965	News briefs. 1965-10 1.1 MB
1959	Pushbutton console for CTC 785.3 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Mobridge, SD 2

1947	Annual Review and Outlook 425.1 KB
1947	Milwaukee Installs Block System on 98 Miles 1.2 MB

Mock, J. C. 5

1937	Changes on the New York Central Lines 2.3 MB
1937	J. C. Mock Retires 1.4 MB
1940	Personal: Changes on the New York Central 2.2 MB
1911	Railway Signal Association Convention: Committee I: Signaling Practice 3.8 MB
1924	Study of Train Control on the Michigan Central 2.1 MB

Mock, WA 1

1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

Model 2 electric interlocking 5

1934	An Electric Interlocking on the Southern Pacific 1.8 MB
1936	New Electric Interlocking and Signaling at the Mississippi River Bridge at New Orleans 7.9 MB
1923	News of the Month. 1923-10 1.9 MB
1923	News of the Month. 1923-11 1.8 MB
1929	NYC Expands Electric Plant By Adding 48 Levers 2.7 MB

Model 2A semaphore 3

1940	Controller Adjuster 1.3 MB
1936	Semaphore Type Crossing Gate Developed on the Alton 8.3 MB
1935	Snubbing Rectifier for 2A Signal 1.9 MB

Model 5 electric interlocking 2

1935	New York Central Extends South Bend Interlocking 6.0 MB
1936	New York Central Interlocking at Syracuse 15.9 MB

Model 15 AC relays 1

1940	Plug Couplers for Relays and Signals 1.3 MB

model boards 2

1956	Plastic Track Model Is Big Picture for Levermen 1.4 MB
1941	Track Model Lamps 429.7 KB

model railroad 2

1932	Miniature Signal System a Hobby 606.4 KB
1941	Railway Exhibit Presented to Museum of Science and Industry 636.5 KB

Modena, PA 1

1935	Preventing Unnecessary Operation of Highway-Railroad Crossing Signals 4.3 MB

modular signal design 1

1966	Modular signal design is here 1.7 MB

Moffat Tunnel 7

1941	Automatic Signaling and Tunnel Protection On the Denver & Salt Lake 6.7 MB
1950	CTC Extended on the Rio Grande 4.4 MB
1943	CTC on 107 Miles of Single-Track on the Rio Grande 9.7 MB
1946	CTC on 128 Miles of Denver & Salt Lake 10.1 MB
1922	News of the Month. 1922-06 516.2 KB
1944	Rio Grande has Longest CTC 9.2 MB
1944	Signals Direct Trains at Junction On the Denver & Rio Grande Western and the Denver & Salt Lake 2.8 MB

Mojave, CA 6

1947	ICC Holds Signal Hearing 507.5 KB
1960	News briefs. 1960-03 1.9 MB
1960	News briefs. 1960-05 1.0 MB
1960	News briefs. 1960-07 845.4 KB
1962	News briefs. 1962-02 1.4 MB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Mokane, MO 1

1943	Lap Order Results in an Accident 818.6 KB

Moline, IL 1

1941	Protection at 38 Street Crossings In and Near Rock Island, Ill 3.1 MB

Molong, New South Wales, Australia 1

1922	Single Track Signaling in Australia 527.7 KB

Momence, IL 1

1925	Division Train Control Installation on C&EI Approved by ICC 2.9 MB

Moncton, NB 1

1963	News briefs. 1963-03 790.6 KB

Moncton, New Brunswick 4

1960	CNR opens Moncton yard 760.9 KB
1960	News briefs. 1960-11 875.5 KB
1961	News briefs. 1961-07 648.9 KB
1959	Signaling moderate during '58 528.6 KB

Monee, IL 3

1922	News of the Month. 1922-08 394.0 KB
1922	News of the Month. 1922-09 562.2 KB
1923	Signaling Increases Capacity of Three Tracks 7.3 MB

Monett, MO 1

1947	Frisco Moves CTC to One Office 481.1 KB

Monmouth Jct., NJ 1

1937	New Signaling on Pennsylvania 1.0 MB

Monon 14

1932	A Detector Bar Fails 1.5 MB
1917	Block Signals on the Monon 675.3 KB
1942	Chicago, Indianapolis & Louisiville Modernizes Automatic Signaling 3.9 MB
1950	Differentiation Between Signals 955.8 KB
1908	Electro-Pneumatic Interlocking Plant On the Chicago & Western Indiana Railroad at 47th Street, Chicago 3.9 MB
1952	Interlockings Modernized at Three Railroad Crossings 974.7 KB
1927	Miller Train Control On the Monon 582.2 KB
1941	Monon Changes Approved 760.8 KB
1945	Monon Remote Control Signaling Saves Train Time 3.5 MB
1958	News briefs. 1958-01 1.8 MB
1963	News briefs. 1963-01 951.3 KB
1925	The Train Control Situation 853.0 KB
1928	Train Order Indicators Used Successfully on the CI&L 604.3 KB
1965	What's the answer? 1965-12 261.7 KB

Monon, IN 3

1942	Chicago, Indianapolis & Louisiville Modernizes Automatic Signaling 3.9 MB
1927	Miller Train Control On the Monon 582.2 KB
1941	Monon Changes Approved 760.8 KB

Monona, MN 1

1940	New Automatic Block Signaling on the Milwaukee 6.3 MB

monorail 1

1962	News briefs. 1962-03 1.1 MB

Monroe, NC 1

1961	News briefs. 1961-04 1.5 MB

Monroe, VA 2

1962	News briefs. 1962-03 1.1 MB
1962	News briefs. 1962-05 826.8 KB

Mont, IL 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Montague, MA 1

1959	Signaling moderate during '58 528.6 KB

Montauk, NY 1

1952	Speed Control Installed on the Long Island 1.3 MB

Montclair, NJ 1

1931	The Signaling of the Lackawanna Electrified Territory 5.9 MB

Montgomery, AL 4

1944	L&N Installs CTC On an Engine District 9.0 MB
1962	News briefs. 1962-05 826.8 KB
1965	News briefs. 1965-05 1.4 MB
1965	News briefs. 1965-09 381.8 KB

Montgomery, IL 3

1965	Indication locking inadequate says ICC in report 849.9 KB
1964	News briefs. 1964-07 833.0 KB
1964	News briefs. 1964-11 797.3 KB

Montpelier, OH 1

1950	CTC on the Wabash 2.6 MB

Montpelier, VA 1

1960	News briefs. 1960-01 1.1 MB

Montreal, Quebec 13

1949	A Mile-Stone In Signaling 1.2 MB
1965	AFO circuits can be used in subways 676.7 KB
1944	Canadian National installs new type of all-relay interlocking at Montreal 7.0 MB
1947	Choice of Interlocking Control Machines 266.5 KB
1962	Computer Simulation of CTC 220.3 KB
1950	Consolidation of Interlockings 2.5 MB
1951	More Signal Construction in 1950 1.0 MB
1960	News briefs. 1960-06 1.2 MB
1965	News briefs. 1965-11 1.2 MB
1959	Signaling moderate during '58 528.6 KB
1962	Toronto Railway Conference – Automatic Train Operation 448.4 KB
1915	Victoria Jubilee Bridge Protection 570.0 KB
1936	Yard Entrance in Montreal Remotely Controlled 8.2 MB

Montvale, VA 1

1949	Either-Direction Running on Two Tracks on the Norfolk & Western 5.5 MB

moose 1

1949	Communications Trouble 2.0 MB

Moose Jaw, Saskatchewan 2

1961	News briefs. 1961-04 1.5 MB
1959	Pushbutton console for CTC 785.3 KB

Moosejaw, Saskatchewan 1

1962	News briefs. 1962-05 826.8 KB

Moravia, IA 1

1935	Automatic Interlocking on the Wabash 2.9 MB

Morgan, H. G. 3

1953	News 2.2 MB
1935	Night Check of Signal Lights 1.2 MB
1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Mormon, CA 1

1955	News briefs. 1955-08 830.4 KB

Morning Sun, IA 2

1935	Accident at Automatic Plant 4.5 MB
1935	Improving Automatic Interlockings 3.5 MB

Morris, IL 3

1944	Coded Track Circuits for CTC and Cab Signaling 4.0 MB
1944	Rock Island Installs Cab Signaling and Centralized Traffic Control 10.0 MB
1949	Signaling Adapted to Traffic On the Rock Island 5.2 MB

Morris, MN 1

1957	GN CTC's 175 miles of mainline 635.9 KB

Morris, OH 1

1941	DT&I Installs Automatic Interlocking 5.0 MB

Morrisburg, Ontario 1

1957	Seaway diverts CN mainline 532.3 KB

Morrison, IL 2

1960	Crossings are safer after 10 years 454.4 KB
1956	Gates Installed at Five Crossings … Barriers at Four.pdf 5.0 MB

Morrisville, PA 3

1959	Hot box detector sets signals 1.2 MB
1937	New Signaling on Pennsylvania 1.0 MB
1938	Pennsylvania Electrification Signaling 5.3 MB

Morse, Samuel F. B. 3

1944	Centennial of Morse Telegraph 6.6 MB
1958	RS&C 50th anniversary: Railroad communications ... from Morse to microwave 3.3 MB
1944	St. Louis-San Francisco Installs Centralized Traffic Control 1.1 MB

Morton Park Yard, Cicero, IL 1

1947	Burlington Uses Radio on Switchers 909.1 KB

Moscow, Soviet Union 1

1964	Eight cities test automatic train operation 1.1 MB

motor car indicator 1

1954	Motor Car Indicator 813.5 KB

motor car indicators 15

1949	625 Miles of CTC in one Stretch 7.9 MB
1962	Automatic Dispatching 2.1 MB
1955	Both ways on both tracks with CTC 765.0 KB
1955	CTC and cab signaling on Union Pacific 789.5 KB
1947	CTC Has Long Sidings With Signals on the Santa Fe 2.1 MB
1936	Electric Lights for Semaphores and Train Approach Indicators on the Rock Island 8.9 MB
1957	How to make non-stop meet with CTC 576.9 KB
1936	Motor Car Indicators 2.9 MB
1949	New Automatic Block on the Katy 4.7 MB
1951	Power Switches and Spring Swiches in CTC on the Frisco 1.2 MB
1955	Santa Fe installs CTC on single track 610.2 KB
1949	Signaling Saves Time on Frisco 4.8 MB
1944	St. Louis-San Francisco Installs Centralized Traffic Control 8.3 MB
1949	Train Indicator for Motor Car 1.0 MB
1956	Union Pacific Installs Protection For Motor Cars at Tunnels 3.2 MB

motor car protection 1

1951	Both Tracks Both Ways on Norfolk & Western 623.5 KB

motor cars 5

1939	Checking Track Circuits From a Motor Car 837.6 KB
1937	Flag and Torpedo Containers 903.1 KB
1965	News briefs. 1965-03 781.8 KB
1965	News briefs. 1965-07 788.3 KB
1965	What's the Answer? 1965-07 629.7 KB

Mott Haven, NY 3

1935	Multiple-Block Signaling 7.0 MB
1931	New York Central Re-Signals Track Entering Grand Central Terminal 4.0 MB
1931	The Mott Haven Interlocking 3.7 MB

Moulton, IL 1

1951	Single-Track With CTC Handles 40 Trains Daily 530.8 KB

Mound City, KS 1

1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Moundsville, WV 1

1961	News briefs. 1961-07 648.9 KB

Mount Morris, MI 2

1958	C&O Has Good Ideas in CTC 2.5 MB
1928	Pere Marquette Installs Centralized Control Signal System 3.2 MB

Mount Pleasant, IA 1

1951	More Signal Construction in 1950 1.0 MB

Mount Union, PA 1

1963	News briefs. 1963-10 497.4 KB

Mount Vernon, NY 1

1944	New York Central Modernizes an Interlocking 5.0 MB

Mountain Glenn, IL 1

1948	CTC Big Help to GM&O 1.7 MB

Mountain Lake Park, MD 1

1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Mountour 1

1955	CTC enables P&LE to remove fourth main track 515.3 KB

Mountsville, WV 1

1965	B&O would have used radio orders 565.5 KB

movable bridge 3

1951	Burlington Installs Extensive Interlocking at Kansas City 1.0 MB
1910	Electric Drawbridge Interlocking 1.2 MB
1915	Victoria Jubilee Bridge Protection 570.0 KB

movable bridges 4

1950	Audible Warning Sounded When Dragging Equipment Detectors Operate 4.2 MB
1935	Checking Rail Ends on Drawbridges 2.5 MB
1949	Fast Work Laying Submarine Cable 3.1 MB
1935	Interlocking on Southern Pacific Suisun Bay Bridge 4.6 MB

movable point frogs 1

1922	Locking Arrangement for Movable Point Crossing Frogs 527.0 KB

movement authority 1

1965	B&O would have used radio orders 565.5 KB

movement authority by radio 1

1965	B&O would have used radio orders 565.5 KB

moving block 1

1964	San Francisco will test four ATO systems 1.4 MB

moving CTC machines 1

1950	Frisco Moves CTC Machines Without Interrupting Traffic 2.9 MB

Mozambique 1

1965	Rhodesia has 1215 miles of CTC 949.2 KB

MQ Crossing, NY 1

1935	Collision on the Erie 2.2 MB

Mt. Iron, MN 1

1962	DM&IR Consolidates CTC Control Miles 384.7 KB

Mt. Pleasant, TX 2

1954	Why Cotton Belt Installed CTC On 429 Miles of Single Track 4.0 MB
1957	Why Cotton Belt installed CTC on entire main line 914.0 KB

Mt. Pleasant, WA 1

1947	Signals and Slide Fences on the Spokane, Portland & Seattle 1.8 MB

Mullanphy St., St. Louis, MO 1

1908	Interlocking Facilities of the St. Louis Terminal Railroad Assn. of St. Louis 7.2 MB

Mullens, WV 1

1943	Centralized Traffic Control Installed on the Virginian 7.0 MB

multiple unit electric interlocking 1

1910	The Multiple Unit Electric Interlocking Machine 1.5 MB

multiple-aspect signaling 6

1935	Letter to the Editor- Comment on Multiple Aspects 1.5 MB
1943	Modernization of Automatic Signaling On the New York Central 9.8 MB
1935	Multiple Aspect Signaling 3.3 MB
1935	Multiple-Block Signaling 7.0 MB
1943	New Haven Installs Five-Aspect Signaling Controlled By Coded Track Circuits 7.4 MB
1944	New York Central Installs Coded Track Circuits 3.9 MB

multiple-unit interlocking 1

1909	Union Switch & Signal’s Inspection Trip 1.5 MB

Mulvane, KS 2

1962	News briefs. 1962-09 838.3 KB
1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Mumbai, India 1

1951	Extension of Color-Light Signaling on the Bombay, Baroda & Central India Railway 524.0 KB

Mundelein, IL 1

1926	North Shore Line Installs Two Electric Interlockers 2.1 MB

Mungen, OH 1

1965	News briefs. 1965-06 1.2 MB

Muphysville, IL 1

1947	Railroads Request Relief from the ICC Signal Order 365.7 KB

Murphysboro, IL 1

1948	CTC Big Help to GM&O 1.7 MB

Murry Bridge, South Australia 1

1922	Single Track Signaling in Australia 527.7 KB

Muscatine, IA 1

1949	Signaling Adapted to Traffic On the Rock Island 5.2 MB

Museum of Science & Industry, Chicago, IL 1

1941	Railway Exhibit Presented to Museum of Science and Industry 636.5 KB

Musselman, OH 1

1937	APB, Remote Control, and CTC on the Baltimore & Ohio 11.9 MB

Myerstown, PA 1

1922	Work in Signal Field Shows Gain Over 1920 784.5 KB

Myrtle Avenue Line, Brooklyn, NY 2

1925	Automatic Interlocking of a Double Track Junction on BMT Lines 1.8 MB
1935	Automatic Interlocking on the Brooklyn-Manhattan Transit 5.4 MB

Railway Signaling: M