AOK
| Arkansas-Oklahoma Railroad | 1 |
CMHX
| CarMath Incorporated | 1 |
IBT
| International Bridge and Terminal Company | 4 |
KCS
| Kansas City Southern | 1 |
MP
| Missouri Pacific | 6 |
MWCX
| Midwest Railcar Corporation | 2 |
NS
| Norfolk Southern | 5 |
TR
| Tomahawk Railway L.P. | 1 |
UP
| Union Pacific Railroad Company | 1 |