BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 1 |
CSX
| CSX Railroad | 5 |
DLW
| Delaware Lackawanna & Western | 1 |
IAIS
| Iowa Interstate | 1 |
NS
| Norfolk Southern | 8 |
NW
| Norfolk & Western | 5 |
PPLX
| Pennsylvania Power and Light Company | 1 |
RBMN
| Reading Blue Mountain & Northern | 1 |
SCWX
| South Carolina Public Service Authority | 6 |
UCEX
| Union Electric Company | 1 |
WFAX
| Western Fuels Association Incorporated (Colo.) | 3 |