BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 1 |
CR
| Conrail | 2 |
GREX
| Georgetown Rail Equipment Company | 2 |
HZGX
| Herzog Contracting Corporation | 1 |
NS
| Norfolk Southern | 3 |
NW
| Norfolk & Western | 1 |
PC
| Penn Central | 1 |
RMSX
| Pandrol Jackson Incorporated | 5 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
UP
| Union Pacific Railroad Company | 2 |