The following abbreviations are not necessarily the official railroad reporting marks but abbreviations I used to label the gif files.
| AA | Ann Arbor Railroad |
| AAX | Agrico |
|
ABB |
Akron Barberton Belt Railroad Company |
| ABL | Alameda Belt Line |
| AC | Algoma Central Railway |
|
ACE |
Altamont
Commuter Express |
| ACJ | Ashtabula Carson Jefferson Railroad Company Incorporated |
|
ACL |
Atlantic
Coast Line |
|
ACWR |
Aberdeen
Carolina & Western Railway |
| ACY | Akron, Canton & Youngstown Railroad |
|
ADBF |
Adrian
& Blissfield Rail Road Company |
| ADM | Archer Daniels Midland |
|
ADN |
Ashley,
Drew & Northern Railway Company |
| AES | A. E. Staley Manufacturing Company |
| AESX | Associated Electric Cooperative Incorporated |
|
AF |
Alabama
& Florida Railway Company |
|
AGR |
Alabama
& Gulf Coast Railway |
|
AGRI |
American
Agriculture Chemical Company |
|
AGTX |
AmeriGas
Propane L.P. |
| AGWAY | AGWAY Corporation |
| AJ | Alcoa in Jamaica |
|
AKDN |
Acadiana
Railway Company
|
|
ALCO |
American
Locomotive Company |
| ALM | Arkansas & Louisiana Missouri Railway Company |
| ALQS | Aliquippa & Southern Railroad Company |
| ALS | Alstom Canada Incorporated |
| AM | Arkansas & Missouri Railroad |
| AMAX | AMAX Coal Company |
| AMC | Amador Central Railroad Company |
| AHMSA | Altos Hornos de Mexico, S.A. |
| AMT | Agence metropolitaine de transport |
|
AMTK |
National
Railroad Passenger Corporation (Amtrak) |
|
AN |
Albany
and Northern |
| ANR | Angelina & Neches River Railroad Company |
|
AOCX |
Aluminum
Company of America (Squaw Valley Coal) |
|
APA |
Apache
Railway Company |
| APN | Apalachicola Northern Railroad |
|
APNC |
Appanoose
County Community Railroad
|
|
APRA |
Alberta
Pioneer Railway Association |
| APRR | Albany Port Railroad |
| APN | Apalachicola Northern Railroad |
|
AR |
Aberdeen
& Rockfish Railroad Company |
| ARC | Alexander Railroad Company |
| ARCH | Arch of Kentucky |
| ARCO | ARCO Petroleum |
| ARMCO | ARMCO Steel |
|
ARMD |
Arkansas
Midland Railroad |
| ARMX | Armco Steel Corporation |
|
ARR |
Alaska
Railroad |
|
ARZC |
Arizona
& California Railroad Company |
| AS | Alton & Southern Railroad |
|
ASAB |
Atlanta
& Saint Andrews Bay |
| ASCX | Allied Signal Corporation |
| ASI | American Steel Foundry |
| ASRR | Adirondack Scenic Railroad |
|
ASRY |
Ashland
Railway Incorporated |
|
AT |
Auto-Train |
|
ATL |
AT&L |
| ATLX | Atlas Machine and Iron Works Incorporated |
|
ATSF |
Atchison,
Topeka & Santa Fe Railway |
|
ATW |
Atlantic
and Western Railway |
|
AUNW |
Austin
& Northwestern Railroad |
| AVFR | Avtex Fibers |
|
AVR |
Allegheny
Valley Railroad Company |
|
AW |
Ahnapee
& Western Railway |
|
AWP |
Atlanta
& West Point Rail Road |
|
AWW |
Algers,
Winslow & Western Railroad |
|
AZER |
Arizona
Eastern Railway |
| AZGR | Arizona Grain |
|
BAP |
Buenos
Aires al Pacifico |
|
BAP |
Butte
Anaconda & Pacific |
|
BAR |
Bangor
& Aroostook Railroad |
| BARR | Baltimore & Annapolis Railroad |
| BPRR | Buffalo Pittsburgh Railroad Incorporated |
|
BCH |
Southern
Railway of British Columbia Limited |
| BCK | Buffalo Creek Railroad |
|
BCLR |
Bay
Colony Railroad |
| BCER | British Columbia Electric Railway |
|
BCR |
British
Columbia Rail |
|
BCX |
Boeing
Company |
| BDC | Bosques De Chihuahua S. De R. L. |
| BDLX | BDL Company |
|
BDRV |
Belvidere
& Delaware River Railway |
| BEC | Bellefonte Historical Railway |
| BEDT | Brooklyn Eastern District Terminal |
| BESE | Berkshire Scenic Railroad |
| BFC | Bellefonte Central Railroad |
|
BFIX |
Bethlehem
Steel Corporations |
| BH | Bath & Hammondsport Rail Corporation |
|
BHP |
BHP
Nevada Railroad Company |
| BHP | BHP Iron Ore (Broken Hill Proprietary) |
| BHRC | Bath & Hammondsport Railroad Company |
| BJRY | Burlington Junction Railway |
|
BLE |
Bessemer
& Lake Erie Railroad |
|
BLOL |
Bloomer
Line |
|
BLW |
Baldwin
Locomotive Works |
|
BM |
Boston
& Maine Railroad |
| BMC | Badger Mining Corporation |
| BME | Brookville Locomotive Company |
|
BML |
Belfast
and Moosehead Lake Railroad |
|
BMS |
Berlin
Mills Railway Incorporated |
|
BN |
Burlington
Northern Railroad |
|
BNSF |
Burlington
Northern & Santa Fe |
|
BO |
Baltimore
& Ohio Railroad |
|
BPRR |
Buffalo
& Pittsburgh Railroad Incorporated |
|
BQC |
Quebec
Central (Canadian Pacific Railway) |
| BRLX | Burlington River Loading, Incorporation |
|
BRC |
Belt
Railway of Chicago |
|
BRW |
Black
River & Western Railroad Corporation |
| BSC | Bayou Steel Corporation |
| BSCO | Bethlehem Steel Corporation |
| BSGX | Becker Sand & Gravel |
| BSOR | Buffalo Southern Railroad |
|
BSR |
Birmingham
Southern Railroad Company |
| BSRX | Branson Scenic Railway |
| BSU | Bayou Steel |
| BVRY | Brandywine Valley Railway |
| CACV | Cooperstown & Charlotte Valley Railway |
| CAD | Cadiz Railroad |
|
CAGY |
Columbus
& Greenville Railway Company |
|
CALA |
Carolina
Southern Railroad |
|
CALT |
California
Department of Transportation (Caltrain) |
| CANX | CANAC International Incorporation |
| CARG | Cargill Incorporation |
|
CBG |
Companie de Bauxite du Guinea |