AMTK
| Amtrak | 1 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
CPOX
| Consumers Power Company (Mich.) | 2 |
CSX
| CSX Railroad | 1 |
DOTX
| USDOT/Federal Railroad Administration | 2 |
IC
| Illinois Central | 2 |
KCS
| Kansas City Southern | 2 |
RBBX
| Ringling Bros. and Barnum and Bailey | 1 |
SCFE
| South Central Florida Express Incorporated | 1 |
SLSF
| Saint Louis-San Francisco | 1 |
TBCX
| Boeing Company | 3 |
TVRM
| Tennessee Valley | 1 |