ADC
| ADC | 1 |
AIC
| AIC | 2 |
AOC
| AOC | 1 |
AOE
| American Orient Express | 4 |
AOG
| AOG | 1 |
AOK
| Arkansas-Oklahoma Railroad | 11 |
AOKX
| Greenbrier Management Services, LLC | 1 |
ATW
| Atlantic and Western | 2 |
BNSF
| BNSF Railway | 1 |
BTCX
| Browner Turnout Company | 6 |
BVR
| BVR | 1 |
CCRX
| Cape Cod Railroad | 2 |
CCTX
| Coleto Creek Power WLE, LP | 1 |
CCXX
| Costain Coal Incorporated | 2 |
CP
| Canadian Pacific Railway | 1 |
CTTZ
| CTTZ | 1 |
CW
| Colorado and Wyoming | 2 |
DODX
| Department Of Defense | 160 |
ECRX
| Econo-Rail Corp. | 1 |
ECXX
| East Carbon Development Company | 17 |
EXX
| EXX | 2 |
GBRX
| Greenbrier Leasing Corporation | 2 |
GNWR
| Genesee and Wyoming Railroad Company | 1 |
HKRX
| HKRX | 1 |
HTTX
| TTX Company | 6 |
ICE
| Iowa Chicago and Eastern | 1 |
IOC
| IOC | 1 |
IOL
| IOL | 1 |
ITTX
| TTX Company | 38 |
JOBX
| Tealinc Limited | 1 |
JTTX
| TTX Company | 1 |
KRL
| Kasgro Rail Lines | 1 |
LTTX
| TTX Company | 1 |
MP
| Missouri Pacific | 4 |
MTTX
| TTX Company | 2 |
OJTX
| OJTX | 1 |
OTTX
| TTX Company | 17 |
PTTX
| TTX Company | 18 |
QTTX
| TTX Company | 3 |
RTTX
| TTX Company | 4 |
SP
| Southern Pacific | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
TBCX
| Boeing Company | 1 |
TCX
| General American Marks Company | 1 |
TOEX
| TOEX | 1 |
TPCX
| TPCX | 1 |
TPDX
| TPDX | 62 |
TPOX
| TPOX | 24 |
TTDX
| TTX Company - DOD Service Flats | 29 |
TTX
| TTX Company | 1 |
UP
| Union Pacific Railroad Company | 25 |
XTTX
| TTX Company | 9 |