AMTK
| Amtrak | 2 |
CNJ
| Central Rail Road of New Jersey | 3 |
DLW
| Delaware Lackawanna & Western | 3 |
DOTX
| USDOT/Federal Railroad Administration | 1 |
LCRA
| LCRA | 1 |
LV
| Lehigh Valley | 1 |
MILW
| Milwaukee Road | 1 |
NHRX
| New Haven National Rail Terminal | 1 |
PRR
| Pennsylvania Railroad | 6 |
RDG
| Reading Railroad | 2 |
SP
| Southern Pacific | 1 |
SRC
| Strasburg Railroad | 5 |
UP
| Union Pacific Railroad Company | 1 |
UPP
| Union Pacific Passenger | 2 |
WM
| Western Maryland | 1 |