ATSF
| Atchison Topeka & Santa Fe | 8 |
BN
| Burlington Northern | 14 |
BNSF
| BNSF Railway | 27 |
CBQ
| Chicago Burlington & Quincy | 1 |
DRGW
| Denver & Rio Grande Western | 7 |
HMIX
| Henkels and McCoy Inc | 1 |
LMIX
| Loram Maintenance of Way Inc. | 2 |
LORA
| LORA | 2 |
OWRN
| OWRN | 1 |
RMSX
| Pandrol Jackson Incorporated | 1 |
SPMW
| Southern Pacific Maintenance of Way | 55 |
SSWM
| SSWM | 3 |
UP
| Union Pacific Railroad Company | 11 |