ATSF
| Atchison Topeka & Santa Fe | 7 |
BN
| Burlington Northern | 6 |
CBQ
| Chicago Burlington & Quincy | 1 |
CC
| Chicago Central & Pacific | 2 |
CGW
| Chicago Great Western | 3 |
CNW
| Chicago & Northwestern | 5 |
DRGW
| Denver & Rio Grande Western | 1 |
GN
| Great Northern | 2 |
IC
| Illinois Central | 1 |
ICG
| Illinois Central Gulf | 3 |
MILW
| Milwaukee Road | 2 |
UP
| Union Pacific Railroad Company | 6 |