ALS
| Alton & Southern Railway | 2 |
ATSF
| Atchison Topeka & Santa Fe | 3 |
BN
| Burlington Northern | 1 |
BO
| Baltimore & Ohio | 5 |
CBQ
| Chicago Burlington & Quincy | 1 |
CGW
| Chicago Great Western | 1 |
CNW
| Chicago & Northwestern | 3 |
CO
| Chesapeake & Ohio | 1 |
CSX
| CSX Railroad | 1 |
EJE
| Elgin Joliet and Eastern | 1 |
GN
| Great Northern | 3 |
ICG
| Illinois Central Gulf | 1 |
LN
| Louisville & Nashville | 2 |
MKT
| Missouri-Kansas-Texas | 1 |
MRS
| Manufacturers Railway | 4 |
NKP
| Nickel Plate | 1 |
NS
| Norfolk Southern | 2 |
NYC
| New York Central | 1 |
PC
| Penn Central | 1 |
SLSF
| Saint Louis-San Francisco | 2 |
SOU
| Southern | 1 |
SP
| Southern Pacific | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
TRRA
| Terminal RR of St Louis | 5 |
UP
| Union Pacific Railroad Company | 4 |
WAB
| Wabash | 1 |
WVRR
| Whitewater Valley Railroad | 1 |