ATSF
| Atchison Topeka & Santa Fe | 10 |
BN
| Burlington Northern | 5 |
BNSF
| BNSF Railway | 2 |
CNW
| Chicago & Northwestern | 3 |
CR
| Conrail | 1 |
EE
| Ellis and Eastern Company | 1 |
GREX
| Georgetown Rail Equipment Company | 14 |
HLMX
| Helm Financial Corporation | 1 |
HZGX
| Herzog Contracting Corporation | 65 |
LGEX
| L.G. Everist Incorporated | 4 |
MKT
| Missouri-Kansas-Texas | 1 |
MP
| Missouri Pacific | 1 |
MRL
| Montana Rail Link | 2 |
NS
| Norfolk Southern | 4 |
SI
| Union Pacific Railroad Company (Spokane International) | 5 |
SP
| Southern Pacific | 1 |
SPMW
| Southern Pacific Maintenance of Way | 3 |
UP
| Union Pacific Railroad Company | 85 |
WP
| Western Pacific | 2 |