AOK
| Arkansas-Oklahoma Railroad | 1 |
ATSF
| Atchison Topeka & Santa Fe | 3 |
BNSF
| BNSF Railway | 4 |
BTCX
| Browner Turnout Company | 18 |
CNA
| Canadian National Railways | 6 |
CSX
| CSX Railroad | 1 |
FRR
| Falls Road Railroad Company Incorporated | 1 |
FTTX
| TTX Company | 117 |
GBRX
| Greenbrier Leasing Corporation | 2 |
GIMX
| General American Marks Company | 1 |
GNWR
| Genesee and Wyoming Railroad Company | 8 |
GTTX
| TTX Company - Flat Cars | 5 |
GTW
| Grand Trunk Western | 2 |
ITTX
| TTX Company | 455 |
JTTX
| TTX Company | 17 |
LBR
| Lowville and Beaver River Railroad Compa | 12 |
MRL
| Montana Rail Link | 1 |
NS
| Norfolk Southern | 22 |
NTTX
| TTX Company | 2 |
PEYX
| Transportation Technology Services Inc | 1 |
PTTX
| TTX Company | 91 |
QUAX
| Redstreak, LLC | 1 |
SFS
| Santa Fe Southern | 4 |
SOU
| Southern | 20 |
SP
| Southern Pacific | 2 |
TTDX
| TTX Company - DOD Service Flats | 75 |
TTXX
| TTX Company | 14 |