AMTK
| Amtrak | 6 |
AOK
| Arkansas-Oklahoma Railroad | 2 |
APEX
| Apex Tank Car Line | 1 |
ATW
| Atlantic and Western | 2 |
BO
| Baltimore & Ohio | 1 |
BTCX
| Browner Turnout Company | 2 |
CO
| Chesapeake & Ohio | 5 |
COVX
| COVANTA SUSTAINABLE SOLUTIONS LLC | 3 |
CSX
| CSX Railroad | 30 |
DODX
| Department Of Defense | 34 |
DSEX
| East Carbon Development Company | 11 |
FEC
| Florida East Coast | 10 |
FTSX
| Fairmont Tamper | 7 |
GIMX
| General American Marks Company | 8 |
HTTX
| TTX Company | 4 |
HTX
| HTX | 1 |
ICE
| Iowa Chicago and Eastern | 1 |
ITTX
| TTX Company | 28 |
KRL
| Kasgro Rail Lines | 4 |
LBR
| Lowville and Beaver River Railroad Compa | 3 |
LHFX
| Lehigh Heavy Forge Corporation | 1 |
LMIC
| Lake Michigan & Indiana Railroad | 1 |
MCVX
| Massuchusetts Call/Volunteer Firefighters Assoc. | 1 |
ME
| Morristown & Erie Railroad | 1 |
MTTX
| TTX Company | 3 |
MVCX
| MVCX | 1 |
NS
| Norfolk Southern | 10 |
NYC
| New York Central | 6 |
PKP
| Polish Railways | 1 |
PRSX
| Progress Rail Service | 1 |
PTTX
| TTX Company | 14 |
QTTX
| TTX Company | 4 |
QUAX
| Redstreak, LLC | 1 |
RDG
| Reading Railroad | 2 |
RSGX
| RSGX | 7 |
RTTX
| TTX Company | 2 |
SBD
| Seaboard System | 7 |
SOXX
| SMBC RAIL SERVICES LLC | 1 |
SPSX
| Progress Rail Services Corp | 4 |
STCX
| Sterling China Company(Captive Service) | 1 |
TFWX
| TTX COMPANY | 2 |
TPDX
| TPDX | 3 |
TTJX
| TTX Company-Bulkhead Flats | 1 |
TTXX
| TTX Company | 1 |
URR
| Union Railroad | 1 |
USWX
| USA Waste Services Incorporated | 39 |
WWRR
| WWRR | 1 |
XTTX
| TTX Company | 1 |