ABOX
| TTX Company | 1 |
BNSF
| BNSF Railway | 1 |
CNW
| Chicago & Northwestern | 2 |
DRGW
| Denver & Rio Grande Western | 1 |
IFRX
| Infinity Rail LLC | 1 |
MP
| Missouri Pacific | 3 |
NS
| Norfolk Southern | 3 |
SOU
| Southern | 1 |
SP
| Southern Pacific | 4 |
SSW
| St Louis Southwestern (Cotton Belt) | 3 |
TBOX
| TTX Company | 2 |
UP
| Union Pacific Railroad Company | 1 |