ATSF
| Atchison Topeka & Santa Fe | 3 |
BN
| Burlington Northern | 3 |
CNW
| Chicago & Northwestern | 6 |
CO
| Chesapeake & Ohio | 1 |
CP
| Canadian Pacific Railway | 1 |
CSX
| CSX Railroad | 1 |
FXE
| Ferromex | 1 |
MI
| Missouri & Illinois | 1 |
MKT
| Missouri-Kansas-Texas | 1 |
MP
| Missouri Pacific | 2 |
MWCX
| Midwest Railcar Corporation | 1 |
NS
| Norfolk Southern | 1 |
NW
| Norfolk & Western | 1 |
SBD
| Seaboard System | 1 |
SOU
| Southern | 1 |
SP
| Southern Pacific | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
UP
| Union Pacific Railroad Company | 8 |
WP
| Western Pacific | 3 |
WWUX
| Unimin Corporation | 1 |