BNSF
| BNSF Railway | 6 |
CN
| Canadian National Railways | 5 |
CR
| Conrail | 1 |
CWRX
| CWR TRANSPORTATION CO. | 1 |
HZGX
| Herzog Contracting Corporation | 1 |
IC
| Illinois Central | 4 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
NS
| Norfolk Southern | 2 |
NW
| Norfolk & Western | 1 |
RWCX
| RWC Incorporated | 2 |
UP
| Union Pacific Railroad Company | 1 |