ATW
| Atlantic and Western | 1 |
BNSF
| BNSF Railway | 2 |
CMHX
| CarMath Incorporated | 2 |
CNA
| Canadian National Railways | 1 |
CSX
| CSX Railroad | 5 |
ICG
| Illinois Central Gulf | 1 |
KCS
| Kansas City Southern | 3 |
MP
| Missouri Pacific | 1 |
NOKL
| Northwestern Oklahoma | 2 |
NS
| Norfolk Southern | 1 |
RBOX
| Railbox Company | 1 |
SIRX
| Southern Illinois Railcar Company | 1 |
SOO
| Soo Line | 1 |
SP
| Southern Pacific | 2 |
TBOX
| TTX Company | 2 |