AMTK
| Amtrak | 11 |
ARR
| Alaska Railroad | 6 |
CESX
| CENTRAL STATES RAIL ASSOCIATES, INC. | 1 |
LN
| Louisville & Nashville | 1 |
MILW
| Milwaukee Road | 1 |
NP
| Northern Pacific | 1 |
RETX
| RETX | 1 |
RUT
| Vermont Railway Incorporated | 1 |
SOU
| Southern | 3 |
TVRM
| Tennessee Valley | 1 |
UP
| Union Pacific Railroad Company | 1 |
W
| W | 1 |