AMTK
| Amtrak | 7 |
DOTX
| USDOT/Federal Railroad Administration | 1 |
INPR
| Idaho Northern and Pacific Railroad | 5 |
LI
| Long Island Rail Road Company | 1 |
RBBX
| Ringling Bros. and Barnum and Bailey | 1 |
RPCX
| Railroad Passenger Car Numbering Bureau | 3 |
UPP
| Union Pacific Passenger | 4 |