AKMD
| Arkansas Midland Railroad Company | 6 |
BR
| Buffalo and Pittsburgh | 3 |
CSX
| CSX Railroad | 4 |
MP
| Missouri Pacific | 2 |
NS
| Norfolk Southern | 1 |
NW
| Norfolk & Western | 2 |
NYC
| New York Central | 7 |
SP
| Southern Pacific | 28 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
TR
| Tomahawk Railway L.P. | 1 |
UP
| Union Pacific Railroad Company | 1 |