 | ATSF SD40 | Atchison, Topeka and Santa Fe Railway | | | 2 |
 | ATSF SD40u | Atchison, Topeka and Santa Fe Railway | | | 2 |
 | BN SD40 | Burlington Northern | | | 2 |
 | BN SD40B | Burlington Northern | | | 1 |
 | C&O SD40 | Chesapeake and Ohio Railway | | | 2 |
 | CN SD40 | Canadian National Railway | | | 3 |
 | CNW SD40 | Chicago and North Western Transportation Company | | | 1 |
 | CP SD40 | Canadian Pacific Railway | | | 1 |
 | CR SD40 | Conrail: Consolidated Rail Corporation | | | 4 |
 | CRR SD40 | Clinchfield Railroad | | | 1 |
 | GM&O SD40 | Gulf Mobile & Ohio | | | 1 |
 | GTW SD40 | Grand Trunk Western Railroad | | | 1 |
 | HLCX SD40 | Helm Leasing Company | | | 1 |
 | KCS SD40 | Kansas City Southern Railway | | | 4 |
 | MKCX SD40 | Morrison Knudsen Corporation | | | 1 |
 | MP SD40 | Missouri Pacific | | | 6 |
 | NS SD40 | Norfolk Southern Railway | | | 1 |
 | NW SD40 | Norfolk and Western Railway | | | 2 |
 | SOO SD40 | Soo Line Railroad | | | 3 |
 | UP SD40 | Union Pacific Railroad | | | 5 |
 | UTAH SD40M | Utah Railway | | | 1 |
 | WE SD40 | Wheeling and Lake Erie Railway | | | 1 |
 | WFAX SD40 | Western Fuels Association | | | 1 |