BO
| Baltimore & Ohio | 8 |
CN
| Canadian National Railways | 2 |
CO
| Chesapeake & Ohio | 1 |
CR
| Conrail | 21 |
CSX
| CSX Railroad | 78 |
GREX
| Georgetown Rail Equipment Company | 1 |
HTT
| Harsco Track Technologies | 2 |
KRM
| Kentucky Railway Museum | 1 |
LIRC
| Louisville & Indiana | 1 |
LMIX
| Loram Maintenance of Way Inc. | 12 |
LN
| Louisville & Nashville | 2 |
MCIX
| SSI Mobley Company Incorporated (M of W) | 1 |
NHVR
| New Hope Valley Railroad | 1 |
NS
| Norfolk Southern | 4 |
NW
| Norfolk & Western | 5 |
NYC
| New York Central | 6 |
PAL
| Paducah & Louisville | 2 |
PALX
| Paducah & Louisville | 1 |
PRR
| Pennsylvania Railroad | 2 |
RMSX
| Pandrol Jackson Incorporated | 36 |
RWCX
| RWC Incorporated | 11 |
SBD
| Seaboard System | 4 |
SCL
| Seaboard Coast Line | 1 |
SOU
| Southern | 14 |