ACL
| Atlantic Coast Line | 1 |
ATSF
| Atchison Topeka & Santa Fe | 2 |
CSX
| CSX Railroad | 19 |
JNSX
| JNS Marketing Company Coastline Rail Service Division | 1 |
LN
| Louisville & Nashville | 3 |
MILW
| Milwaukee Road | 1 |
MP
| Missouri Pacific | 1 |
NS
| Norfolk Southern | 2 |
RPRC
| Richmond Pacific Railroad Corporation | 1 |
SBD
| Seaboard System | 3 |
SCL
| Seaboard Coast Line | 1 |
SP
| Southern Pacific | 3 |
UP
| Union Pacific Railroad Company | 3 |
WM
| Western Maryland | 1 |