AKMD
| Arkansas Midland Railroad Company | 3 |
AOK
| Arkansas-Oklahoma Railroad | 4 |
BNSF
| BNSF Railway | 1 |
CAGY
| Columbus & Greenville Railway | 1 |
CBRY
| Copper Basin Railway | 1 |
CLC
| Columbia and Cowlitz Railway Company | 1 |
HLSC
| Hampton Railway Incorporated | 1 |
TTZX
| TTX Company-Centerbeam Flats | 13 |