ATSF
| Atchison Topeka & Santa Fe | 3 |
BN
| Burlington Northern | 1 |
CBQ
| Chicago Burlington & Quincy | 1 |
CCT
| Central California Traction Company | 1 |
DRGW
| Denver & Rio Grande Western | 3 |
MP
| Missouri Pacific | 1 |
ONW
| Oregon & Northwestern | 1 |
SP
| Southern Pacific | 7 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
UP
| Union Pacific Railroad Company | 1 |
WP
| Western Pacific | 1 |