BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 4 |
CR
| Conrail | 6 |
GREX
| Georgetown Rail Equipment Company | 1 |
IC
| Illinois Central | 1 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
NS
| Norfolk Southern | 3 |
NW
| Norfolk & Western | 17 |
SOU
| Southern | 2 |
THM
| THM | 1 |
UP
| Union Pacific Railroad Company | 2 |