AOK
| Arkansas-Oklahoma Railroad | 3 |
ARR
| Alaska Railroad | 1 |
CHTT
| Chicago Heights Terminal Transfer | 1 |
DME
| Dakota, Minnesota and Eastern | 2 |
HPJX
| Helm-Pacific Leasing | 1 |
IBT
| International Bridge and Terminal Company | 4 |
KCS
| Kansas City Southern | 5 |
MP
| Missouri Pacific | 1 |
MWCX
| Midwest Railcar Corporation | 1 |
NS
| Norfolk Southern | 1 |
UP
| Union Pacific Railroad Company | 1 |