BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 2 |
CNW
| Chicago & Northwestern | 3 |
DAPX
| Dairyland Power Cooperative (Wis.) | 1 |
DEEX
| Detroit Edison Company | 1 |
DRGW
| Denver & Rio Grande Western | 1 |
MP
| Missouri Pacific | 2 |
SP
| Southern Pacific | 1 |
TFM
| Kansas City Southern De Mexico | 1 |