AAR
| Association of American Railroads | 2 |
AMTK
| Amtrak | 4 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
CN
| Canadian National Railways | 2 |
CNJ
| Central Rail Road of New Jersey | 1 |
CNW
| Chicago & Northwestern | 2 |
CO
| Chesapeake & Ohio | 3 |
CSL
| Chicago Short Line Railway Company | 1 |
CSS
| Chicago South Shore And South Bend | 1 |
DAFX
| Department of Defence Troop Support and Aviation Material Re | 1 |
DLMX
| Daylight Locomotives and Machine Works Incorporated | 1 |
DOTX
| USDOT/Federal Railroad Administration | 1 |
DRCX
| Denver Railway Car Co | 2 |
DRGW
| Denver & Rio Grande Western | 1 |
FSX
| FSX | 1 |
GCRY
| Grand Canyon Railway | 1 |
GMO
| Gulf Mobile & Ohio | 2 |
GTW
| Grand Trunk Western | 1 |
LSRC
| Lake State Railway Company | 1 |
MHWA
| Mohawk Adirondack and Northern Railroad | 1 |
MILW
| Milwaukee Road | 1 |
MSTX
| MSTX | 3 |
NKP
| Nickel Plate | 1 |
NW
| Norfolk & Western | 1 |
PNWC
| PNWC | 2 |
PRR
| Pennsylvania Railroad | 1 |
RBBX
| Ringling Bros. and Barnum and Bailey | 5 |
RBMN
| Reading Blue Mountain & Northern | 1 |
RCPX
| Railcar Limited | 1 |
RGSX
| RGSX | 2 |
RPCX
| Railroad Passenger Car Numbering Bureau | 2 |
SBD
| Seaboard System | 1 |
SNCF
| French National Railways | 1 |
STC
| STC | 3 |
TSCX
| The Steel Company of Canada, Ltd. | 1 |
TVRM
| Tennessee Valley | 1 |
UP
| Union Pacific Railroad Company | 1 |
UPP
| Union Pacific Passenger | 1 |
USAX
| United States Army | 1 |
VIA
| Via Rail Canada | 1 |