ATSF
| Atchison Topeka & Santa Fe | 6 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 15 |
CNW
| Chicago & Northwestern | 6 |
DRGW
| Denver & Rio Grande Western | 4 |
MP
| Missouri Pacific | 7 |
MWAX
| Martin Marietta Materials Incorporated | 3 |
NIHX
| General Electric Rail Services | 1 |
NS
| Norfolk Southern | 2 |
RBMN
| Reading Blue Mountain & Northern | 1 |
UP
| Union Pacific Railroad Company | 37 |
WP
| Western Pacific | 21 |