APA
| Apache Railway Company | 1 |
ARR
| Alaska Railroad | 7 |
BNSF
| BNSF Railway | 3 |
CNW
| Chicago & Northwestern | 2 |
CP
| Canadian Pacific Railway | 2 |
DRGW
| Denver & Rio Grande Western | 1 |
MP
| Missouri Pacific | 3 |
MRL
| Montana Rail Link | 1 |
OCSR
| OCSR | 1 |
POVA
| Pend Oreille Valley Railroad | 1 |
UP
| Union Pacific Railroad Company | 1 |
WCRC
| Washington Central | 2 |