AGR
| Alabama and Gulf Coast | 1 |
AKMD
| Arkansas Midland Railroad Company | 1 |
ALAB
| Alabama Railroad | 2 |
AOK
| Arkansas-Oklahoma Railroad | 1 |
BO
| Baltimore & Ohio | 6 |
CO
| Chesapeake & Ohio | 1 |
CSX
| CSX Railroad | 2 |
GMSR
| Kansas City Southern | 1 |
MP
| Missouri Pacific | 1 |
SP
| Southern Pacific | 4 |
SRN
| Sabine River & Northern | 1 |