ATS
| ATS | 1 |
BN
| Burlington Northern | 15 |
BNSF
| BNSF Railway | 17 |
GREX
| Georgetown Rail Equipment Company | 3 |
GVW
| GVW | 1 |
HERZ
| HERZ | 2 |
HZGX
| Herzog Contracting Corporation | 20 |
KCS
| Kansas City Southern | 9 |
LMIX
| Loram Maintenance of Way Inc. | 7 |
MP
| Missouri Pacific | 2 |
PTS
| PTS | 1 |
RG
| RG | 2 |
SRS
| Sperry Rail Service | 4 |
UP
| Union Pacific Railroad Company | 3 |