AMTK
| Amtrak | 2 |
ATSF
| Atchison Topeka & Santa Fe | 3 |
BN
| Burlington Northern | 13 |
BNSF
| BNSF Railway | 19 |
CN
| Canadian National Railways | 2 |
CP
| Canadian Pacific Railway | 5 |
GN
| Great Northern | 2 |
GREX
| Georgetown Rail Equipment Company | 1 |
GVSR
| Galveston Railroad L.P. | 1 |
HZGX
| Herzog Contracting Corporation | 30 |
ITGX
| Andersons - Railgroup | 1 |
MILW
| Milwaukee Road | 7 |
MRL
| Montana Rail Link | 6 |
NP
| Northern Pacific | 4 |
PCC
| Palouse River and Coulee City | 8 |
POVA
| Pend Oreille Valley Railroad | 2 |
SI
| Union Pacific Railroad Company (Spokane International) | 17 |
SOO
| Soo Line | 1 |
SP
| Southern Pacific | 1 |
SPSR
| San Pedro & Southwestern Railway Co | 2 |
UP
| Union Pacific Railroad Company | 7 |
WP
| Western Pacific | 3 |
WSOR
| Wisconsin & Southern | 1 |