BO
| Baltimore & Ohio | 4 |
CO
| Chesapeake & Ohio | 3 |
CP
| Canadian Pacific Railway | 1 |
CSX
| CSX Railroad | 4 |
DUPX
| Du Pont De Nemours and Company Incorporated | 3 |
LMIX
| Loram Maintenance of Way Inc. | 2 |
LNAL
| Louisville New Albany and Corydon Railroad | 1 |
WM
| Western Maryland | 2 |