| Railroad | Reporting Marks |
|---|
| Ann Arbor | |
| Atlantic Coast Line | |
| Alabama R.R. | |
| Alton and Southern | |
| Arkansas & Missouri | |
| Arkansas-Oklahoma | |
| Alaska R.R. | |
| Atchison, Topeka & Santa Fe | |
| Arizona Eastern | |
| Butte, Anaconda & Pacific | |
| Bessemer & Lake Erie | |
| Boston and Maine | |
| Burlington Northern | |
| Burlington Northern Santa Fe | |
| Baltimore & Ohio | |
| Chicago, Burlington & Quincy | |
| Chillicothe-Brunswick Rail Maintenance Authority | |
| Chicago Central & Pacific | |
| Corinth & Counce | |
| Chicago & Eastern Illinois | |
| Central of Georgia | |
| Chicago Great Western | |
| Ferrocarril del Chihuahua Al Pacifico | |
| Chicago Heights Terminal Transfer | |
| Cedar Rapids and Iowa City | |
| Chicago, Missouri and Western | |
| Chicago, St. Paul, Minneapolis & Omaha | |
| Canadian National | |
| Central R.R. Co. of New Jersey | |
| Chicago and North Western | |
| Chesapeake & Ohio | |
| Crab Orchard & Egyptian | |
| Canadian Pacific | |
| Conrail | |
| Clinchfield R.R. | |
| Colorado & Southern | |
| Chicago South Shore & South Bend | |
| CSX Transportation | |
| Central Vermont | |
| Delaware and Hudson | |
| Delaware, Lackawanna & Western` | |
| Dakota, Minnesota & Eastern | |
| Duluth, Missabe & Iron Range | |
| Denver & Rio Grande Western | |
| Davenport, Rock Island & North Western | |
| Duluth, South Shore & Atlantic | |
| Detroit, Toledo & Ironton | |
| Duluth, Winnipeg & Pacific | |
| East Erie Commercial | |
| Elgin, Joliet and Eastern | |
| Erie Lackawanna | |
| Erie R.R. | |
| East St. Louis Junction | |
| Compania de Ferrocarriles Chiapas Mayab | |
| Ferrocarril del Pacifico | |
| Fort Dodge, Des Moines & Southern | |
| Florida East Coast | |
| | Railroad | Reporting Marks |
|---|
| Fort Worth and Denver | |
| Fort Worth & Western | |
| Ferrocarril Mexicano | |
| Georgia R.R. | |
| Green Bay & Western | |
| Gulf, Mobile & Ohio | |
| Green Mountain R.R. | |
| Great Northern | |
| Gateway Eastern | |
| Gateway Western | |
| Hutchinson and Northern | |
| Iowa Interstate | |
| Iowa Northern | |
| Illinois Central | |
| Illinois Central Gulf | |
| Indiana Harbor Belt | |
| I & M Rail Link | |
| Iowa R.R | |
| Illinois Terminal | |
| Joppa & Eastern | |
| Kankakee, Beaverville and Southern | |
| Kansas City, Mexico & Orient | |
| Kansas City Southern | |
| Kansas City Terminal | |
| Kewaunee, Green Bay & Western | |
| Keokuk Junction | |
| Kansas City, Kaw Valley & Western | |
| Kyle R.R. | |
| Louisiana & Arkansas | |
| Los Angeles Union Passenger Terminal | |
| Lehigh & Hudson River | |
| Long Island Rail Road | |
| Louisville & Nashville | |
| Lehigh and New England | |
| Lehigh Valley | |
| Maine Central | |
| Chicago, Milwaukee, St. Paul and Pacific | |
| Missouri-Kansas-Texas | |
| Missouri & Northern Arkansas | |
| Minneapolis, Northfield and Southern | |
| Missouri Central | |
| Monon R.R. | |
| Missouri Pacific | |
| Maryland & Pennsylvania | |
| Manufacturers Ry. | |
| MidSouth Rail Corp. | |
| Minneapolis & St. Louis Ry | |
| Northeast Kansas & Missouri | |
| Nebraska Northeastern | |
| New York, Chicago & St. Louis | |
| Northwestern Oklahoma | |
| New Orleans Public Belt | |
| Northern Pacific | |
| Norfolk Southern | |
| Norfolk and Western | |
| Northwestern Pacific | |
| New York Central | |
| | Railroad | Reporting Marks |
|---|
| New York, Susquehanna and Western | |
| Oklahoma, Kansas and Texas | |
| Omaha, Lincoln and Beatrice | |
| Otter Tail Valley R.R. | |
| Paducah & Louisville | |
| Penn Central Transportation Co. | |
| Pickens R.R. | |
| Pittsburgh & Lake Erie | |
| Peoria & Pekin Union | |
| Pennsylvania R.R. | |
| Pennsylvania-Reading Seashore Lines | |
| Quebec Central | |
| Quincy R.R. | |
| Reading Blue Mountain & Northern | |
| Reading Co. | |
| Richmond, Fredricksburg & Potomac | |
| Chicago, Rock Island & Pacific | |
| Seaboard Air Line | |
| Sandersville R.R. | |
| Seaboard System | |
| Seaboard Coast Line | |
| Southeast Kansas R.R. | |
| Sierra R.R. | |
| South Kansas & Oklahoma | |
| St. Louis-San Francisco | |
| Minneapolis, St. Paul & Sault Ste. Marie | |
| Southern Ry. System | |
| Southern Pacific | |
| Spokane, Portland & Seattle | |
| Sand Springs Ry. Co. | |
| Sault Ste. Marie Bridge Co. | |
| St. Louis Southwestern | |
| Springfield Terminal | |
| Terminal Ry. Alabama State Docks | |
| Toronto, Hamilton & Buffalo | |
| The Texas Mexican Ry. Co. | |
| Texas-New Mexico | |
| Texas & Pacific | |
| Toledo, Peoria & Western | |
| Terminal R.R. Association of St. Louis | |
| Tulsa-Sapulpa Union | |
| Upper Merion and Plymouth | |
| Union Pacific | |
| Union R.R. | |
| Utah Ry. Co. | |
| Virginian Ry. | |
| Western Ry. of Alabama | |
| Wabash R.R. | |
| Wisconsin Central | |
| Wisconsin & Calumet | |
| Waterloo R.R. | |
| Western Maryland | |
| Western Pacific | |
| White Pass & Yukon | |
| Winchester and Western | |
| Yreka Western | |
|
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