BO
| Baltimore & Ohio | 45 |
CO
| Chesapeake & Ohio | 27 |
CSX
| CSX Railroad | 6 |
DGNO
| Dallas Garland & Northeastern | 2 |
DH
| Delaware & Hudson | 1 |
EL
| Erie Lackawanna | 1 |
LN
| Louisville & Nashville | 8 |
SLSF
| Saint Louis-San Francisco | 4 |
UP
| Union Pacific Railroad Company | 1 |
WM
| Western Maryland | 6 |