ACL
| Atlantic Coast Line | 2 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 2 |
BO
| Baltimore & Ohio | 1 |
CO
| Chesapeake & Ohio | 1 |
CSX
| CSX Railroad | 11 |
ICG
| Illinois Central Gulf | 1 |
LN
| Louisville & Nashville | 1 |
RFP
| Richmond Fredericksburg & Potomac | 1 |