ACL
| Atlantic Coast Line | 13 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
BBCX
| ABB Power Generation Incorporated | 1 |
CSX
| CSX Railroad | 1 |
DOTX
| USDOT/Federal Railroad Administration | 2 |
LC
| Lancaster & Chester | 1 |
NS
| Norfolk Southern | 7 |
NYC
| New York Central | 1 |
SH
| Steelton and Highspire Railroad Company | 1 |
SOU
| Southern | 5 |
TVRM
| Tennessee Valley | 23 |
UP
| Union Pacific Railroad Company | 2 |