AMTK
| Amtrak | 1 |
ATEX
| Asplundh Tree Expert Co Railroad Division | 10 |
ATSF
| Atchison Topeka & Santa Fe | 8 |
BN
| Burlington Northern | 5 |
BNSF
| BNSF Railway | 24 |
CBQ
| Chicago Burlington & Quincy | 3 |
CN
| Canadian National Railways | 7 |
CP
| Canadian Pacific Railway | 12 |
CTXX
| CTXX | 1 |
CWC
| Charleston & Western Carolina | 6 |
GREX
| Georgetown Rail Equipment Company | 20 |
HZGX
| Herzog Contracting Corporation | 10 |
LMIX
| Loram Maintenance of Way Inc. | 15 |
MBTA
| Massachusetts Bay Transit Authority | 2 |
METX
| METRA | 7 |
MKT
| Missouri-Kansas-Texas | 5 |
MP
| Missouri Pacific | 29 |
NS
| Norfolk Southern | 2 |
NW
| Norfolk & Western | 2 |
PACX
| Plasser American Corporation | 1 |
SPMW
| Southern Pacific Maintenance of Way | 3 |
SSW
| St Louis Southwestern (Cotton Belt) | 8 |
UP
| Union Pacific Railroad Company | 82 |
VMTX
| VMTX | 1 |
WSOR
| Wisconsin & Southern | 3 |