BN
| Burlington Northern | 21 |
BNSF
| BNSF Railway | 28 |
FTSX
| Fairmont Tamper | 6 |
GCRY
| Grand Canyon Railway | 1 |
HZGX
| Herzog Contracting Corporation | 1 |
LMIX
| Loram Maintenance of Way Inc. | 3 |
RRVW
| Red River Valley and Western Railroad | 1 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
UP
| Union Pacific Railroad Company | 14 |