ATSF
| Atchison Topeka & Santa Fe | 17 |
BN
| Burlington Northern | 24 |
CCT
| Central California Traction Company | 2 |
CLC
| Columbia and Cowlitz Railway Company | 3 |
CSP
| Camas Prairie RailNet Incorporated | 3 |
GN
| Great Northern | 3 |
SP
| Southern Pacific | 64 |
SPS
| Spokane Portland & Seattle | 3 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
UP
| Union Pacific Railroad Company | 16 |
WP
| Western Pacific | 1 |
WX
| WX | 2 |