BM
| Boston & Maine | 1 |
BN
| Burlington Northern | 3 |
BNSF
| BNSF Railway | 1 |
BO
| Baltimore & Ohio | 1 |
CP
| Canadian Pacific Railway | 4 |
CR
| Conrail | 2 |
CSS
| Chicago South Shore And South Bend | 1 |
CSX
| CSX Railroad | 3 |
DIM
| DIM | 1 |
DL
| Delaware-Lackawanna Railroad Company | 1 |
DLW
| Delaware Lackawanna & Western | 1 |
DODX
| Department Of Defense | 3 |
DRGW
| Denver & Rio Grande Western | 1 |
DSL
| Denver & Salt Lake | 1 |
GN
| Great Northern | 1 |
GNBC
| Grainbelt Corporation | 1 |
GSMR
| Great Smoky Mountains | 2 |
MBTA
| Massachusetts Bay Transit Authority | 1 |
MP
| Missouri Pacific | 3 |
NKP
| Nickel Plate | 1 |
NYC
| New York Central | 2 |
PRR
| Pennsylvania Railroad | 4 |
RPCX
| Railroad Passenger Car Numbering Bureau | 1 |
SOU
| Southern | 1 |
SP
| Southern Pacific | 1 |
WM
| Western Maryland | 2 |