AMTK
| Amtrak | 17 |
ARR
| Alaska Railroad | 7 |
BN
| Burlington Northern | 3 |
CRIP
| Chicago Rock Island & Pacific | 1 |
CSS
| Chicago South Shore And South Bend | 1 |
DOTX
| USDOT/Federal Railroad Administration | 5 |
GN
| Great Northern | 4 |
GTW
| Grand Trunk Western | 4 |
ICG
| Illinois Central Gulf | 1 |
KCS
| Kansas City Southern | 1 |
MILW
| Milwaukee Road | 2 |
MP
| Missouri Pacific | 1 |
MSTX
| MSTX | 1 |
NP
| Northern Pacific | 3 |
NW
| Norfolk & Western | 1 |
RFRX
| Rick Franklin Corporation | 1 |
SP
| Southern Pacific | 1 |
SPMW
| Southern Pacific Maintenance of Way | 2 |
SPS
| Spokane Portland & Seattle | 3 |
WURR
| WURR | 2 |