BCH
| Southern Railway of British Columbia Limited | 3 |
BNSF
| BNSF Railway | 5 |
GN
| Great Northern | 2 |
HZGX
| Herzog Contracting Corporation | 1 |
MKCX
| Morrison Knudsen Corporation | 7 |
MKT
| Missouri-Kansas-Texas | 2 |
MPA
| Maryland and Pennsylvania Railroad | 2 |
PGE
| Pacific Great Eastern | 3 |
RMSX
| Pandrol Jackson Incorporated | 2 |