ATSF
| Atchison Topeka & Santa Fe | 1 |
BN
| Burlington Northern | 6 |
BNSF
| BNSF Railway | 2 |
CT
| City of Columbia d/b/a Columbia Terminal | 1 |
GREX
| Georgetown Rail Equipment Company | 2 |
HZGX
| Herzog Contracting Corporation | 3 |
KCS
| Kansas City Southern | 2 |
KMUX
| Kershaw Manufacturing Company | 1 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
MP
| Missouri Pacific | 7 |
MSRC
| Kansas City Southern | 3 |
NW
| Norfolk & Western | 1 |
SOU
| Southern | 2 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
TVRR
| Tulare Valley Railroad Company | 12 |
UP
| Union Pacific Railroad Company | 2 |
WWEX
| Wood Waste Energy Incorporated | 1 |