AGR
| Alabama and Gulf Coast | 3 |
AOK
| Arkansas-Oklahoma Railroad | 1 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
ATW
| Atlantic and Western | 1 |
BN
| Burlington Northern | 3 |
CBQ
| Chicago Burlington & Quincy | 1 |
CN
| Canadian National Railways | 1 |
CSX
| CSX Railroad | 1 |
DRGW
| Denver & Rio Grande Western | 3 |
GN
| Great Northern | 1 |
GTRA
| Golden Triangle Railroad | 1 |
GTW
| Grand Trunk Western | 1 |
HS
| H and S Railroad Company | 1 |
IBT
| International Bridge and Terminal Company | 1 |
KCS
| Kansas City Southern | 3 |
MP
| Missouri Pacific | 3 |
NOKL
| Northwestern Oklahoma | 1 |
NP
| Northern Pacific | 1 |
SLSF
| Saint Louis-San Francisco | 1 |
SOU
| Southern | 5 |
SP
| Southern Pacific | 6 |
SPS
| Spokane Portland & Seattle | 1 |
SRN
| Sabine River & Northern | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
TBOX
| TTX Company | 1 |
UP
| Union Pacific Railroad Company | 3 |
UPP
| Union Pacific Passenger | 1 |
WC
| Wisconsin Central | 6 |