AARX
| Association of American Railroads | 3 |
ACWR
| Aberdeen, Carolina & Western | 2 |
AMTK
| Amtrak | 24 |
BO
| Baltimore & Ohio | 2 |
BOMX
| B&O Railroad Museum Inc. | 1 |
CHRR
| Chesapeake Railroad Company | 2 |
CNW
| Chicago & Northwestern | 5 |
CO
| Chesapeake & Ohio | 2 |
CSX
| CSX Railroad | 22 |
MARC
| Maryland Transit Administration | 35 |
MCVX
| Massuchusetts Call/Volunteer Firefighters Assoc. | 6 |
MILW
| Milwaukee Road | 1 |
MRLX
| Mid America Rail Car Leasing | 9 |
NRHS
| NRHS | 1 |
NS
| Norfolk Southern | 5 |
NW
| Norfolk & Western | 1 |
NYC
| New York Central | 3 |
PM
| Pere Marquette | 1 |
PULL
| Pullman | 1 |
RNHX
| RNHX | 1 |
RNRH
| RNRH | 1 |
RPCX
| Railroad Passenger Car Numbering Bureau | 3 |
SCLX
| CanadianOxy Industrial Chemicals Limited Partnership | 4 |
SLCX
| St. Lawrence Cement Inc. | 1 |
SLSX
| SLSX | 1 |
SOU
| Southern | 1 |
TC
| Temple & Central Texas | 4 |
TC1
| Tennessee Central | 2 |
TCRX
| Tennessee Central Railway Musem | 25 |
TX
| TX | 1 |
VLIX
| Vintage Locomotives Inc | 5 |
VRE
| Virginia Railway Express | 15 |