ATEX
| Asplundh Tree Expert Co Railroad Division | 2 |
BN
| Burlington Northern | 1 |
BO
| Baltimore & Ohio | 2 |
BR
| Buffalo and Pittsburgh | 1 |
CO
| Chesapeake & Ohio | 2 |
CR
| Conrail | 6 |
CSX
| CSX Railroad | 38 |
FRA
| Federal Railroad Administration | 1 |
LBFX
| L B Foster Co | 1 |
LMIX
| Loram Maintenance of Way Inc. | 2 |
LMX
| LMX | 1 |
NS
| Norfolk Southern | 4 |
NW
| Norfolk & Western | 10 |
PC
| Penn Central | 1 |
SBD
| Seaboard System | 5 |
SCL
| Seaboard Coast Line | 1 |
SOU
| Southern | 3 |
SRS
| Sperry Rail Service | 5 |