ATSF
| Atchison Topeka & Santa Fe | 13 |
BN
| Burlington Northern | 12 |
CLC
| Columbia and Cowlitz Railway Company | 3 |
CSP
| Camas Prairie RailNet Incorporated | 2 |
GN
| Great Northern | 3 |
SP
| Southern Pacific | 19 |
SPS
| Spokane Portland & Seattle | 2 |
UP
| Union Pacific Railroad Company | 6 |
WP
| Western Pacific | 1 |
WX
| WX | 2 |