| Abbreviation | Railroad Name |
| AP | A&P Foods
|
| ALR | Aatlantic Richfield
|
| ABBOTTS | Abbotts
|
| AR | Aberdeen & Rockfish
|
| ACWR | Aberdeen Carolina & Western
|
| AG | Abervill Grimes
|
| SHPX | ACF Industries Inc.
|
| ACFX | Acfx
|
| ACME | Acme
|
| ACTOL | ACTOL
|
| ADIR | Adirondack Bottled Gas
|
| ADRIONDACK | Adriondack
|
| AGAR PACKI | Agar Packing; Private Road
|
| AHW | Ahnapee & Western
|
| AIM | AIM Products |
| APPC | AJAR/APPV
|
| ACY | Akron Canton & Youngstown
|
| AGC | Alabama & Gulf Coast
|
| ALC | Alabama Central |
| AGS | Alabama Great Southern
|
| ATN | Alabama, Tennessee&northern
|
| ARR | Alaska Rr
|
| ABLN | Albany & Northern
|
| Alberta | Alberta Grain
|
| ALCAN | Alcan Chemical
|
| ALFA BEER | Alfa Beer
|
| AWW | Algers, Winslow & Western
|
| AC | Algoma Central |
| ALQS | Aliquipa & Southern
|
| ALL | All no Particular RR Specified
|
| ACEX | All Transit Comuter Express
|
| ALY | Allegheny RR
|
| AMD | Alleghney Midland |
| ALLIED | Allied Chemical
|
| AL | Almanor
|
| ALOHA SHAK | Aloha Shake
|
| ALT | Alton & Southern
|
| ALUMAX | Alumax
|
| AMADOR | Amador Central
|
| AMAZIO | Amazio
|
| AMBER | Amber Milling
|
| AMBROSE WI | Ambrose Wine
|
| AMCO | AMCO AFX
|
| RICHMOND | Amer. Locomotive Richmond Wks
|
| AMERICAN | American
|
| AAR | American Assoc Of Rrs
|
| AMER BEEF | American Beef
|
| ACF | American Car & Foundry
|
| AEPX | American Electric Power Service
|
| AMF | American Flyer
|
| AF | American Freedom
|
| AFT | American Freedom Train
|
| AHD | American Hoist & Derrick
|
| ALCO | American Locomotive Company
|
| AMER POTAS | American Potash
|
| APC | American President Company
|
| APL | American President Lines
|
| AREX | American Railway Express
|
| ART | American Refrigeration
|
| AMEX OIL | Amex Oil
|
| AMG | AMG Resources
|
| AMER COLLO | Ammerican Colloid
|
| AMOCO | Amoco Oil
|
| AMTK | Amtrak
|
| ANPX | Anchor Perolium
|
| ANCHOR | Ancor Petrolium
|
| AGLX | Andrews Petroleum
|
| ANR | Angelina & Naches River
|
| ANBU | Anheusier Busch
|
| AA | Ann Arbor
|
| APACHE | Apache RR
|
| AN | Apalachiicola Northern
|
| APCO | APCO
|
| ARAT | Arcade & Attica
|
| AMR | Arcata & Madriver
|
| ADM | Archer Daniel Midl&
|
| ARCO | ARCO Polymers DYLX
|
| Argentine | Argentine Central
|
| ARZC | Arizona & California
|
| AZER | Arizona Eastern
|
| ALM | Arkansas Lousiana Missippi
|
| AM | Arkansas Missouri
|
| AW | Arkansas Western
|
| AOK | Arkansas-Oklahoma Railroad
|
| ARMH | Arm & Hammer
|
| ASCX | Armco Steel
|
| ARMOUR | Armour Meats
|
| AMSTAR | Armour Star Meat Co
|
| AV | Aroostook Valley (electric)
|
| ARTEMUS JE | Artemus Jellico
|
| ARTHUR FAR | Arthur Farms
|
| ASCO | Asco Milk
|
| ASHLAND | Ashland Oil
|
| ADN | Ashley, Drew & Northern |
| ACJR | Ashtabula Carson Jefferson
|
| ATLT | AT&L RR
|
| ATSF | Atchison, Topeka&Santa Fe
|
| ATIOAL | ATIOAL
|
| ATLWP | Atlanta & West Point
|
| ASAB | Atlanta St. Andrews Bay Rr
|
| AEC | Atlantic & East Carolina
|
| AGLF | Atlantic & Gulf
|
| ATLW | Atlantic & Western
|
| ATYK | Atlantic & Yadkin
|
| ACL | Atlantic Coast Line
|
| ATLAS | Atlas
|
| ATW | ATW |
| ATC | Austin & Texas Control
|
| AUSTIN WES | Austin Western
|
