ABOX
| TTX Company | 2 |
BO
| Baltimore & Ohio | 1 |
CR
| Conrail | 4 |
EPRY
| East Penn Railway | 1 |
ERIE
| Erie Railroad | 1 |
GN
| Great Northern | 1 |
LN
| Louisville & Nashville | 1 |
MEC
| Maine Central | 1 |
MRL
| Montana Rail Link | 1 |
MSRC
| Kansas City Southern | 1 |
NS
| Norfolk Southern | 1 |
RBMN
| Reading Blue Mountain & Northern | 1 |
SCL
| Seaboard Coast Line | 1 |
SOU
| Southern | 1 |