ATS
| ATS | 1 |
ATSF
| Atchison Topeka & Santa Fe | 3 |
BC
| BARRE & CHELSEA RAILROAD | 3 |
BN
| Burlington Northern | 63 |
BNSF
| BNSF Railway | 255 |
BNX
| BNX | 1 |
BR
| Buffalo and Pittsburgh | 4 |
BRS
| BRS | 1 |
BTS
| BTS | 1 |
CANX
| CANAC International | 1 |
CATS
| Charlotte Area Transit System | 1 |
CBQ
| Chicago Burlington & Quincy | 1 |
CN
| Canadian National Railways | 1 |
CWR
| CWR Incorporated | 1 |
CWRX
| CWR TRANSPORTATION CO. | 2 |
DC
| Delray Connecting Railroad Company | 1 |
DRGW
| Denver & Rio Grande Western | 5 |
GREX
| Georgetown Rail Equipment Company | 29 |
HLMX
| Helm Financial Corporation | 1 |
HZGX
| Herzog Contracting Corporation | 8 |
MISX
| Milwaukee Solvents and Chemicals Corporation | 1 |
MP
| Missouri Pacific | 9 |
RGAX
| RGAX | 1 |
RMSX
| Pandrol Jackson Incorporated | 10 |
SDAG
| SDAG | 1 |
SLC
| San Luis Central Railroad Company | 1 |
SP
| Southern Pacific | 1 |
SPMW
| Southern Pacific Maintenance of Way | 30 |
SPSX
| Progress Rail Services Corp | 1 |
THC
| THC | 2 |
TMDS
| TMDS | 1 |
TRIP
| TRIP | 1 |
UP
| Union Pacific Railroad Company | 17 |
XG
| XG | 1 |