AOK
| Arkansas-Oklahoma Railroad | 5 |
ATSF
| Atchison Topeka & Santa Fe | 4 |
BN
| Burlington Northern | 3 |
BNSF
| BNSF Railway | 26 |
CN
| Canadian National Railways | 2 |
CSS
| Chicago South Shore And South Bend | 1 |
CW
| Colorado and Wyoming | 1 |
DODX
| Department Of Defense | 15 |
DRGW
| Denver & Rio Grande Western | 4 |
FTTX
| TTX Company | 1 |
GLRX
| Georgetown Loop Railroad Incorporated | 3 |
HTTX
| TTX Company | 2 |
KRL
| Kasgro Rail Lines | 4 |
LMIC
| Lake Michigan & Indiana Railroad | 2 |
LTTX
| TTX Company | 5 |
MRL
| Montana Rail Link | 4 |
MTTX
| TTX Company | 5 |
PTTX
| TTX Company | 1 |
QTTX
| TTX Company | 1 |
QUAX
| Redstreak, LLC | 1 |
RBBX
| Ringling Bros. and Barnum and Bailey | 1 |
SGN
| Silverton, Gladstone & Northerly | 1 |
SP
| Southern Pacific | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
TBCX
| Boeing Company | 2 |
TTHX
| TTX Company - Flat Cars | 4 |
TTMX
| TTX Company | 1 |
TTYX
| TTX Company | 8 |
UP
| Union Pacific Railroad Company | 10 |