AOE
| American Orient Express | 4 |
AOG
| AOG | 1 |
AOK
| Arkansas-Oklahoma Railroad | 6 |
AOKX
| Greenbrier Management Services, LLC | 1 |
ATW
| Atlantic and Western | 2 |
BNSF
| BNSF Railway | 1 |
BTCX
| Browner Turnout Company | 5 |
CCRX
| Cape Cod Railroad | 2 |
CCXX
| Costain Coal Incorporated | 2 |
CP
| Canadian Pacific Railway | 1 |
DODX
| Department Of Defense | 153 |
ECRX
| Econo-Rail Corp. | 1 |
ECXX
| East Carbon Development Company | 15 |
EFVM
| Estrada de Ferro Vitoria-Minas | 1 |
GBRX
| Greenbrier Leasing Corporation | 1 |
GNWR
| Genesee and Wyoming Railroad Company | 1 |
HTTX
| TTX Company | 6 |
ICE
| Iowa Chicago and Eastern | 1 |
ITTX
| TTX Company | 21 |
JTTX
| TTX Company | 1 |
KRL
| Kasgro Rail Lines | 1 |
LTTX
| TTX Company | 1 |
MTTX
| TTX Company | 2 |
OTTX
| TTX Company | 11 |
PTTX
| TTX Company | 14 |
QTTX
| TTX Company | 3 |
RTTX
| TTX Company | 3 |
SDIX
| Steel Dynamics, Inc | 1 |
SP
| Southern Pacific | 2 |
TBCX
| Boeing Company | 1 |
TCX
| General American Marks Company | 1 |
TPDX
| TPDX | 50 |
TPOX
| TPOX | 24 |
TTDX
| TTX Company - DOD Service Flats | 29 |
UP
| Union Pacific Railroad Company | 19 |
XTTX
| TTX Company | 8 |