ATSF
| Atchison Topeka & Santa Fe | 2 |
BCOL
| Canadian National Railways | 2 |
BKTY
| Union Pacific Railroad Company | 2 |
BNSF
| BNSF Railway | 4 |
CC
| Chicago Central & Pacific | 1 |
CEMX
| Cemex Mexico SA de CV | 3 |
CN
| Canadian National Railways | 2 |
CNA
| Canadian National Railways | 2 |
CNW
| Chicago & Northwestern | 3 |
CP
| Canadian Pacific Railway | 2 |
CSX
| CSX Railroad | 5 |
DWC
| Canadian National Railways | 1 |
EEC
| East Erie Commercial Railroad | 1 |
FBOX
| TTX Company | 1 |
FEX
| FEX | 1 |
FSRR
| FerroSur | 1 |
FXE
| Ferromex | 1 |
GTW
| Grand Trunk Western | 1 |
HS
| H and S Railroad Company | 2 |
IBT
| International Bridge and Terminal Company | 2 |
KCS
| Kansas City Southern | 4 |
MKT
| Missouri-Kansas-Texas | 2 |
MP
| Missouri Pacific | 5 |
NERR
| Nashville and Eastern | 2 |
NS
| Norfolk Southern | 1 |
RBOX
| Railbox Company | 1 |
SOUT
| SOUT | 1 |
SP
| Southern Pacific | 15 |
SRN
| Sabine River & Northern | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 3 |
TBOX
| TTX Company | 7 |
TOE
| Texas Oklahoma and Eastern RR Company | 1 |
UP
| Union Pacific Railroad Company | 8 |
WP
| Western Pacific | 3 |