ATEX
| Asplundh Tree Expert Co Railroad Division | 2 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
BN
| Burlington Northern | 3 |
BNSF
| BNSF Railway | 10 |
BR
| Buffalo and Pittsburgh | 1 |
CN
| Canadian National Railways | 1 |
CR
| Conrail | 15 |
CSX
| CSX Railroad | 42 |
GSWR
| Georgia Southwestern | 3 |
MG
| MG | 1 |
MP
| Missouri Pacific | 1 |
MT
| Mississippi and Tennessee RailNet Incorporated | 1 |
NS
| Norfolk Southern | 43 |
NW
| Norfolk & Western | 36 |
PC
| Penn Central | 1 |
PRSX
| Progress Rail Service | 1 |
RMSX
| Pandrol Jackson Incorporated | 2 |
SBD
| Seaboard System | 1 |
SN
| Sacramento Northern | 2 |
SOU
| Southern | 25 |
SRS
| Sperry Rail Service | 5 |
SSW
| St Louis Southwestern (Cotton Belt) | 7 |
UP
| Union Pacific Railroad Company | 1 |
UPX
| UPX | 1 |