ATW
| Atlantic and Western | 2 |
BVRY
| Brandywine Valley Railroad Company | 1 |
CSX
| CSX Railroad | 4 |
DJTX
| Joseph Transportation Incorporated | 3 |
DSEX
| East Carbon Development Company | 9 |
FEC
| Florida East Coast | 3 |
GIMX
| General American Marks Company | 6 |
HTTX
| TTX Company | 9 |
IPCX
| International Paper Company | 1 |
ITTX
| TTX Company | 2 |
KRL
| Kasgro Rail Lines | 6 |
MPA
| Maryland and Pennsylvania Railroad | 2 |
MTTX
| TTX Company | 2 |
NS
| Norfolk Southern | 3 |
OTTX
| TTX Company | 4 |
PRR
| Pennsylvania Railroad | 12 |
PTTX
| TTX Company | 4 |
QTTX
| TTX Company | 7 |
RTTX
| TTX Company | 2 |
SBD
| Seaboard System | 1 |
SOU
| Southern | 1 |
TTEX
| TTX Company - Articulated Flat Cars (TOFC/COFC) | 8 |
TTJX
| TTX Company-Bulkhead Flats | 1 |
TTWX
| TTX Company | 1 |
TTXX
| TTX Company | 7 |
USWX
| USA Waste Services Incorporated | 55 |
WCTR
| WCTU Company White City Terminal Railway | 1 |
WP
| Western Pacific | 1 |
WSRR
| WSRR | 2 |
XTTX
| TTX Company | 5 |