BN
| Burlington Northern | 2 |
CBQ
| Chicago Burlington & Quincy | 1 |
CGW
| Chicago Great Western | 2 |
DAIR
| D and I Railroad Company | 6 |
GN
| Great Northern | 2 |
LGEX
| L.G. Everist Incorporated | 6 |
MILW
| Milwaukee Road | 5 |
NW
| Norfolk & Western | 1 |
SLSF
| Saint Louis-San Francisco | 1 |
TCWR
| Twin Cities and Western | 1 |