APSX
| Arizona Public Service Company | 2 |
BLE
| Bessemer & Lake Erie | 1 |
BN
| Burlington Northern | 2 |
CBQ
| Chicago Burlington & Quincy | 2 |
CEI
| Chicago & Eastern Illinois | 1 |
CNW
| Chicago & Northwestern | 3 |
CS
| Colorado & Southern | 1 |
DRGW
| Denver & Rio Grande Western | 3 |
KO
| Kansas & Oklahoma | 1 |
MP
| Missouri Pacific | 4 |
RBMN
| Reading Blue Mountain & Northern | 1 |
WP
| Western Pacific | 2 |
WPGX
| Western Paving Construction Company | 1 |