ATEX
| Asplundh Tree Expert Co Railroad Division | 3 |
BN
| Burlington Northern | 104 |
CN
| Canadian National Railways | 3 |
GMO
| Gulf Mobile & Ohio | 1 |
HABX
| Habco International Incorporated | 6 |
IC
| Illinois Central | 14 |
ICG
| Illinois Central Gulf | 12 |
LN
| Louisville & Nashville | 11 |
MP
| Missouri Pacific | 19 |
NCSL
| Nashville Chattanooga & St Louis | 2 |
RM
| RM | 1 |
RWCX
| RWC Incorporated | 3 |
SLSF
| Saint Louis-San Francisco | 36 |
SOU
| Southern | 6 |
TP
| Texas & Pacific | 1 |