CNW
| Chicago & Northwestern | 1 |
DRGW
| Denver & Rio Grande Western | 1 |
HZGX
| Herzog Contracting Corporation | 110 |
MP
| Missouri Pacific | 3 |
SI
| Union Pacific Railroad Company (Spokane International) | 23 |
SPMW
| Southern Pacific Maintenance of Way | 6 |
UP
| Union Pacific Railroad Company | 20 |