ATSF
| Atchison Topeka & Santa Fe | 3 |
BN
| Burlington Northern | 8 |
CW
| Colorado and Wyoming | 1 |
GMO
| Gulf Mobile & Ohio | 7 |
LI
| Long Island Rail Road Company | 2 |
MP
| Missouri Pacific | 5 |
NN
| Northern Nevada Railroad Corporation | 1 |
SP
| Southern Pacific | 4 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
UP
| Union Pacific Railroad Company | 3 |