AMTK
| Amtrak | 1 |
ARR
| Alaska Railroad | 4 |
BB
| Buckingham Branch | 1 |
BNSF
| BNSF Railway | 1 |
BO
| Baltimore & Ohio | 3 |
CR
| Conrail | 7 |
CSX
| CSX Railroad | 4 |
FIMX
| Franklin Industrial Minerals | 1 |
HRRC
| Housatonic Railroad Company | 1 |
MP
| Missouri Pacific | 1 |
NS
| Norfolk Southern | 6 |
NW
| Norfolk & Western | 5 |
NYC
| New York Central | 2 |
SCL
| Seaboard Coast Line | 1 |
SOU
| Southern | 1 |
SP
| Southern Pacific | 1 |
SPMW
| Southern Pacific Maintenance of Way | 2 |
UP
| Union Pacific Railroad Company | 1 |