NOTE:
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| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Cherry Street | Toronto | TTR, CN, CP | E | T | junction of TTR and CN Kingston and Bala Subdivisions and CP Belleville Subdivision east of Union Station |
| John Street | Toronto | TTR, CN, CP | E | T | west throat of Toronto Union Station and junctions between CN Oakville and Weston Subdivisions and CP Galt Subdivision west of Union Station |
| Scott Street | Toronto | TTR | E | T | east throat of Toronto Union Station |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Hobart Avenue | Los Angeles | AT&SF, UP | T | ||
| Redondo Jct. | Los Angeles | AT&SF and UP (ex-LA&SL) | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| "I" Street Bridge | Sacramento | SP | B | ||
| Black Point | Black Point | California Northern (ex-NWP) | B | ||
| Brazos | Brazos | California Northern (ex-NWP) | B | ||
| Orwood | Orwood | AT&SF | B | ||
| Petaluma | Petaluma | California Northern (ex-NWP) | B | ||
| Suisun Bay Bridge | Martinez | SP | B |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| K Tower | Washington | Amtrak | R | T | Washington Union Station; modernized in 1980s |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| 21st Street | Chicago | Amtrak (ex-CUS), CR (ex-PRR), IC (ex-IC and ex-GM&O) | EP | T | crossing and junction; formerly run by C&WI (also controls Amtrak Clara St. interlocking in New Orleans, LA) |
| Lake Street | Chicago | Amtrak (ex-CUS) | EP | T | Chicago Union Station north throat |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Blue Island | Blue Island | CN (ex-GTW), CSX (ex-B&OCT), IHB | R | T | crossing |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| South Branch Bridge | Chicago | CSX (ex-B&OCT), IC | E | B | IC St. Charles Air Line bridge over south branch of Chicago River (bridge cabin) |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Bridge 407 | Joliet | CSX (ex-CRI&P) | B | bridge cabin |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Brighton Park | Chicago | CR (ex-PRR, ex-CR&I), CSX (ex-B&OCT), IC (Metra Heritage, ex-GM&O) | M | C | non-interlocked, employees classified as switchtenders; cabin (M, w/pipeline) |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Barrington | Barrington | EJ&E, UP (ex-C&NW) | T | UP Harvard Subdivision (Northwest Line) crossing -- had been staffed on demand; closed May 3, 2003 | |
| Bridge Jct. | Joliet | EJ&E | B | cabin | |
| West Chicago | West Chicago | EJ&E, UP (ex-C&NW) | T | UP Geneva Subdivision (West Line) crossing |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Corwith | Chicago | AT&SF, IC/Metra Heritage (ex-GM&O) | E,R | T | crossing |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Dolton | Dolton | IHB, UP (ex-C&WI, ex-C&EI, CSX (ex-B&OCT), IHB (ex-CR, nee PRR) | M | T | transferred from CR on March 1, 1996 |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| 67th Street | Chicago | Metra (ex-IC) | E | T | South Chicago branch junction |
| Kensington | Chicago | Metra (ex-IC), CSS&SB | R | T | junction with Blue Island branch and CSS&SB |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| A-2 (Western Ave.) | Chicago | Metra/Soo (ex-CMStP&P), UP (ex-C&NW) | EP | T | crossing with UP Geneva Subdivision (West Line) |
| A-5 (Pacific Jct.) | Chicago | Metra/Soo (ex-CMStP&P) | T | junction between Metra Milwaukee District North and West Lines and and Soo Kingsbury branch | |
| B-17 | Bensenville | Metra/Soo (ex-CMStP&P) | R | T | junction; staffed by Soo |
| Rondout | Rondout | Metra/Soo (ex-CMStP&P), EJ&E | R | T | Fox Lake branch junction, EJ&E crossing; staffed by Soo |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| 16th Street | Chicago | Metra (ex-CRI&P), IC | E, R | T | IC (Iowa Division and St. Charles Air Line) crossing |
| Blue Island | Blue Island | Metra (ex-CRI&P) | T | junction between main and suburban lines | |
| Gresham | Chicago | Metra (ex-CRI&P), CRL (ex-CRI&P) | R | T | junction |
| UD | Joliet | Metra (ex-CRI&P), AT&SF, SP (ex-GM&O) | E | T | next to Joliet Union Station |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Cummings Bridge | Chicago | NS (ex-NKP) | B | Calumet River bridge, also controls Pullman Jct.; bridge cabin or tower? |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Barrington | Barrington | UP (ex-C&NW) | O | end of double/triple track; inside depot, part time -- to be remoted to Deval? | |
| CY | Chicago | UP (ex-C&NW), Soo (ex-CMStP&P) | R | T | junction of UP Kenosha and Harvard subdivisions (North and Northwest Lines) and crossing with Soo Kingsbury line; also controls Mayfair interlocking on UP Northwest line and CTC on UP between Clybourn and Winnetka |
| Deval | Des Plaines | UP (ex-C&NW), WC (ex-Soo) | E | T | crossings of UP Harvard Subdivision (Northwest Line), C&NW freight cutoff, WC (ex-Soo) |
| Lake Street | Chicago | UP (ex-C&NW) | E | T | passenger terminal throat |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| BJ Tower | Peoria | P&PU | T | dispatcher, bridge and ex-PT crossing | |
| Pearl | Pearl | Gateway Western (ex-GM&O) | B | Illinois River bridge (bridge cabin) | |
| Ridgely | Springfield | UP (ex-GM&O), C&IM (M, w/pipeline) | M | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Rock Island | Rock Island | Iowa Interstate (ex-CRI&P) | B | Mississippi River bridge; bridge cabin -- not verified |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Centralia (NY) | Centralia | IC, BN (CB&Q), NS (Southern) | R | O | crossing; inside IC yard office |
| Mt. Vernon | Mt. Vernon | UP (ex-C&EI), NS, CSX (ex-L&N) | C | crossing; one-story cabin built 1975 -- to have been closed 1994, but verified as active on May, 2001 |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| HN Cabin | Rose Lake | CSX (ex-B&O), | R | T | CR (ex-PRR), A&S building is a tower in spite of the term "cabin" |
| Lenox | Mitchell | UP (ex-MP, nee NYC), Gateway Eastern, NS (ex-Wabash), A&S, UP (ex-GM&O) | E | T | |
| Willows | East St. Louis | Gateway Eastern | E | T | (ex-PRR), CSX (ex-B&O), TRRA, NS (ex-Southern) |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Calumet | East Chicago | IHB, CSX (ex-B&OCT), EJ&E | M | T | |
| Grasselli | East Chicago | IHB, EJ&E, CSX (ex-B&OCT) | M | T | (M, w/pipeline) |
| Hick | Indiana Harbor | CR (ex-NYC), IHB, EJ&E, CSX (ex-B&OCT) | R | T | bridges and junctions |
| Indiana Harbor Canal Bridge | East Chicago | IHB, EJ&E | C | opens weekdays for trains -- cabin or tower? |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Drawbridge | Michigan City | Amtrak (CR) | R | T | bridge plus CTC on Amtrak Michigan line between Porter, Indiana and Kalamazoo, Michigan; manned by CR |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Burlington | Burlington | BN (ex-CB&Q) | B | Mississippi River bridge (bridge cabin) -- not verified | |
| Sabula | Sabula | Soo (ex-CMStP&P) | B | Mississippi River bridge and short CTC segment; bridge cabin |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Clagg | Louisville | L&I (ex-PRR/CR) | T | bridge, south end; one shift depending on traffic, also controls Louisville & Portland Canal span |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Clara Street | New Orleans | Amtrak (NOUPT) | R | T | controlled Union passenger terminal trackage, was last active brick tower in Louisiana; closed May 27, 2003 with interlocking controlled by Amtrak 21st St. Tower in Chicago, IL. |
| East Bridge Jct. | New Orleans | IC, NOPB, NS (ex-Southern) | E | T | connections at east end of Huey P. Long Bridge; also controls Southport Jct. |
| NOPB Industrial Canal Bridge Tower | New Orleans | CSX (ex-L&N) | T | near drawbridges east of New Orleans -- to be remoted? | |
| West Bridge Jct. | Avondale | UP (ex-T&P, ex-SP), NOPB | E | T | connections at west end of Huey P. Long Bridge |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| WB | West Brunswick | CSX (ex-B&O) | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Beverly Draw | Beverly | Amtrak (MBTA, ex-B&M) Ipswich line | B | open two tricks daily | |
| Gloucester Draw | Gloucester | Amtrak (MBTA, ex-B&M) Gloucester branch | B | ||
| Manchester Draw | Manchester | Amtrak (MBTA, ex-B&M) Gloucester branch | B | open one trick daily and closed during winter | |
| Saugus Draw | Saugus | Amtrak (MBTA, ex-B&M) Ipswich line | B | open two tricks daily | |
| South Bay | ????? | Amtrak (MBTA, ex-NYNH&H) | C | connections and junctions on former New Haven Dorchester Branch; located inside trailer | |
| Waltham | Waltham | Amtrak (MBTA, ex-B&M) | T | in addition to local interlocking, operates various interlockings on ex-B&M Fitchburg line between W. Cambridge and Acton |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Conrail bridge | Detroit | CR (ex-MC) | T | Rouge River bridge, also CP "YD" and CP "MILL" | |
| Delray | Detroit | CSX (ex-C&O), GT, CR (ex-NYC), NS (ex-Wabash) | EM | T | |
| NS Bridge | Detroit | NS (ex-Wabash), GT (ex-D&TSL) | T | Rouge River, also controls GT/CR and CR/NS crossings at Victoria St. and NS/GT crossing at Allen Park | |
| Schaefer | Detroit | CR (ex-MC) | M | T | Open part-time as needed if operator available |
| Short Cut Bridge | River Rouge | CR, GT (ex-DT&I) | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| BO | Kalamazoo | CR (ex-MC) | M, R | T | |
| FN | Trenton | CR (ex-MC), GT | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Hannibal bridge | ????? | NS | B | Missouri River bridge -- not verified | |
| Truman Bridge | ????? | Soo (ex-CMStP&P), UP (ex-C&NW, nee-CRI&P) drawbridge | B | ||
| Ustick | North Kansas City | BN (ex-CB&Q), NS (ex-Wabash) | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Hannibal | Hannibal | NS (ex-Wabash) | R | T | Mississippi River bridge and BN crossing; tower built 1992 to replace previous cabin |
| Louisiana | Louisiana | Gateway Western (ex-GM&O) | B | Mississippi River bridge but not adjacent BN crossing (bridge cabin) |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Carling Tower | Lincoln | BN (ex-CB&Q) | T | east end BN yard, controls functions of former Hall Tower |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Dock | Newark | Amtrak (ex-PRR) | EP | T | also controls Passaic River Bridge |
| Union | Rahway | Amtrak (ex-PRR) | EP, R | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Hack | Jersey City (?) | CR (ex-PRR) | EP, R | T | Passaic & Harsimus Line movable bridge over Hackensack River, CP Kearny, CP Stock, WA-5 Waverly |
| Upper Bay | Newark | CR (ex-PRR, LV) | R | B | National Docks Secondary, movable Newark Bay bridge formerly used jointly by PRR and LV |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Hoboken Terminal | Hoboken | NJT (ex-EL) | T | replaced earlier tower at same interlocking |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Q Tower | Queens | Amtrak (ex-PRR) | EP | T | Sunnyside Yard |
| R Tower | Queens | Amtrak (ex-PRR) | EP | T | Sunnyside Yard |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Babylon | Babylon | LIRR | T | ||
| Brook | Brooklyn | LIRR | T | Flatbush Avenue | |
| Divide | Hicksville | LIRR | T | ||
| Dunton | Jamaica | LIRR | T | ||
| East New York | Queens | LIRR | T | open as needed | |
| Hall | Jamaica | LIRR | T | ||
| Harold | Long Island City | LIRR | T | ||
| Jay | Jamaica | LIRR | T | ||
| Lead | Island Park | LIRR | T | swing bridge -- tower or bridge cabin? | |
| Nassau | Mineola | LIRR | T | ||
| PD | Patchogue | LIRR | T | ||
| Queens | Queens Village | LIRR | T | ||
| Valley | Valley Stream | LIRR | T | ||
| Van | Brooklyn | LIRR | T | Flatbush Avenue tunnel approach, junction, Vanderbilt Avenue Yard, two tricks on weekdays only |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| LAB (Livingston Avenue Bridge) | Albany-Rensselaer | CR (ex-NYC) | R | C | drawbridge -- tower or bridge cabin? |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Bridge 184.50 | ????? | NS (ex-NKP) | B | Cuyahoga River | |
| Bridge 222 | ????? | W&LE (ex-NKP) | T | Cuyahoga River | |
| Bridge 4 | ????? | CR (ex-NYC) | T | Cuyahoga River | |
| Bridge 460 | ????? | CSX (ex-B&O) | B | Cuyahoga River | |
| Drawbridge (DB) | Cleveland | CR (ex-NYC) | T | Cuyahoga River |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Bay Bridge | ????? | CR (ex-NYC) | T | Sandusky Bay bridge | |
| CO | Port Clinton | CR (ex-NYC) | T | drawbridge | |
| F Tower | Fostoria | CSX (ex-B&O), CSX (ex-C&O), NS (ex-NKP) | R | T | |
| HN | Newton Falls | CSX (ex-B&O) | EP | T | tower is part of depot structure |
| JM | Ashtabula | CR (ex-NYC) | T | tower/drawbridge | |
| RU | Lorain | Black River Bridge, NS (ex-NKP) | B |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Hallett | Toledo | AA-CSX (ex-TT) | EM | T | |
| Ironville | Toledo | NS (ex-NKP)-CSX (ex-TT) | T | closed January 19, 2004; standing | |
| Lower Bridge | Toledo | CSX (ex-TT) | B | Maumee River | |
| Stanley (SA) | Toledo | CR (ex-NYC) | E | T | |
| Walbridge | Toledo | CR (ex-PRR), CSX (ex-C&O) | EP | T | |
| Walbridge | Toledo | CSX (ex-C&O) | O | yard office |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| VI | Connellsville | CSX (ex-B&O) | O | ex "D" (inside old yard office) |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Alto | Altoona | CR (ex-PRR) | T | ||
| C (Conemaugh) | Johnstown | CR (ex-PRR) | EP | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| East Conway | East Conway | CR (ex-PRR) | T | ||
| Glenwood | Glenwood | CSX (ex-B&O) | EP | T | |
| Midland | Midland | ??? | T | part time -- who operates? |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Cork | Lancaster | Amtrak (ex-PRR) | EP | T | |
| Overbrook | Philadelphia | Amtrak (ex-PRR) | EP | T | |
| Paoli | Paoli | Amtrak (ex-PRR) | EP, R | T | |
| Park | Parkesburg | Amtrak (ex-PRR) | T | open only as needed | |
| State | Harrisburg | Amtrak (ex-PRR), CR (ex-PRR, RDG) | EP, R | O | inside Harrisburg depot |
| Thorn | Thorndale | Amtrak (ex-PRR) | R | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| North Philadelphia | Philadelphia | Amtrak | EP | T | |
| Zoo | Philadelphia | Amtrak (ex-PRR) | EP | T |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| A | Philadelphia | SEPTA, CR (ex-RDG) | T | new tower (block-like building) built 1984, controls Airport Line, CR access |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Chestnut Hill West | Chestnut Hill | SEPTA (ex-PRR) | O | inside station, part time |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Broad | Philadelphia | SEPTA (ex-PRR) | R | O | office inside Suburban Station |
| Mark | Philadelphia | SEPTA | O | Market Street East station, also controls Vine; new office built 1984 | |
| Wayne Jct. | Philadelphia | SEPTA (ex-RDG) | T | tower also houses Wind, controls various interlockings on SEPTA's ex-RDG trackage |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| #106 (Tower A) | Dallas | UP | T | Dallas Union Terminal | |
| #121 | San Antonio | SP | E,R | T | yard |
| #17 | Rosenburg | SP, AT&SF | E | T | |
| #47 | El Paso | SP | T | yard | |
| #97 (Causeway) | Galveston | AT&SF, SP, UP | O | office | |
| Beaumont (no number) | Beaumont | KCS | R | T | Neches River bridge and adjacent junctions with SP, AT&SF |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| Bridge 5 | Norfolk | NS (ex-N&W) | T | controls several junctions and a drawbridge (tower off end of bridge) |
| Name | Location | Railroad(s) | Machine | Structure | Notes |
|---|---|---|---|---|---|
| HO | Hancock | CSX (ex-B&O) | M | T | (M, w/pipeline); slated to close late 2001 |
| MK | Rowlesburg | CSX (ex-B&O) | M | T | M&K Jct. |
| NA | Martinsburg | CSX (ex-B&O) | R | C | cabin; slated to close early 2001 |
| Z | West Keyser | CSX (ex-B&O) | M | T | (M, w/pipeline) |
| Machine type symbols: | |
|---|---|
| E | Electric (typically GRS model machine). |
| EM | Electro-mechanical. This type of machine has a mechanical frame with separate electrical levers that are either electrically or mechanically interlocked with mechanical frame. |
| EP | Electro-pneumatic (typically US&S model machine). |
| M | Mechanical frame (old “armstrong” or “strong-arm” levers). The presence of pipeline-operated switches, derails, or signals is indicated when known. |
| R | All-relay machine. Includes CTC- and “NX” or “UR”-style panels, as well as other more modern variants that lack mechanical locking. |
| Structure type symbols: | |
| B | Movable bridge cabin, on or next to bridge. |
| C | Cabin (one-story free-standing building). |
| O | Office (e. g., yard office or depot building). |
| T | Tower (building with two or more stories) |