ABOX
| TTX Company | 1 |
AOK
| Arkansas-Oklahoma Railroad | 2 |
ATW
| Atlantic and Western | 1 |
BN
| Burlington Northern | 3 |
BNSF
| BNSF Railway | 1 |
CN
| Canadian National Railways | 1 |
CP
| Canadian Pacific Railway | 1 |
CSX
| CSX Railroad | 1 |
DWC
| Canadian National Railways | 1 |
FBOX
| TTX Company | 1 |
IBT
| International Bridge and Terminal Company | 2 |
KCS
| Kansas City Southern | 1 |
MRL
| Montana Rail Link | 1 |
TBOX
| TTX Company | 2 |
TOE
| Texas Oklahoma and Eastern RR Company | 1 |
WC
| Wisconsin Central | 1 |
WP
| Western Pacific | 1 |