BN
| Burlington Northern | 1 |
CR
| Conrail | 3 |
GRW
| Gary Railway | 1 |
ICG
| Illinois Central Gulf | 1 |
NOKL
| Northwestern Oklahoma | 3 |
NW
| Norfolk & Western | 1 |
PC
| Penn Central | 2 |
PRSX
| Progress Rail Service | 1 |
SPSX
| Progress Rail Services Corp | 1 |
TR
| Tomahawk Railway L.P. | 1 |
WCRC
| Washington Central | 1 |