 | @private-us SD40-2 | Private owners group | | | 2 |
 | ARZC SD40-2 | Arizona and California Railroad | | | 2 |
 | ATSF SD40-2 | Atchison, Topeka and Santa Fe Railway | | | 32 |
 | AWRR SD40-2 | Austin Western Railroad | | | 1 |
 | BN SD40-2 | Burlington Northern | | | 64 |
 | BNSF SD40-2 | BNSF Railway | | | 20 |
 | BPRR SD40-2 | Buffalo and Pittsburgh Railroad | | | 1 |
 | CEFX SD40-2 | CIT Equipment Finance Corporation | | | 2 |
 | CEFX SD40M-2 | CIT Equipment Finance Corporation | | | 3 |
 | CEMEX SD40-2 | CEMEX | | | 1 |
 | CITX SD40-2 | CIT Equipment Finance Corporation | | | 7 |
 | CNW SD40-2 | Chicago and North Western Transportation Company | | | 18 |
 | CP SD40-2 | Canadian Pacific Railway | | | 31 |
 | CR SD40-2 | Conrail: Consolidated Rail Corporation | | | 5 |
 | CRIP SD40-2 | Chicago, Rock Island and Pacific Railroad | | | 2 |
 | CSXT SD40-2 | CSX Transportation | | | 17 |
 | DAIR SD40-2 | D and I Railroad | | | 1 |
 | DCR SD40-2 | Delmarva Central Railroad | | | 2 |
 | DME SD40-3 | Dakota, Minnesota and Eastern Railroad | | | 3 |
 | EFC SD40-2 | Estrada de Ferro Carajás | | | 0 |
 | FCCA SD40-2 | Ferrocarril Central Andino | | | 1 |
 | FEC SD40-2 | Florida East Coast Railway | | | 5 |
 | FURX SD40-2 | First Union Rail | | | 1 |
 | FWWR SD40-2 | Fort Worth and Western Railroad | | | 0 |
 | FXE SD40-2 | Ferromex | Ferrocarril Mexicano | | 1 |
 | GLLX SD40-2 | Great Lakes Locomotive | | | 1 |
 | GSCX SD40-2 | General American Marks Company | | | 1 |
 | HLCX SD40-2 | Helm Leasing Company | | | 3 |
 | ICE SD40-2 | Iowa, Chicago and Eastern Railroad | | | 8 |
 | INRD SD40-2 | Indiana Rail Road | | | 1 |
 | IORY SD40-2 | Indiana and Ohio Railway | | | 1 |
 | ISRR SD40-2 | Indiana Southern Railroad | | | 3 |
 | ISRR SD40-2 | Indiana Southern Railroad | | | 0 |
 | JLCX SD40-2 | 564109 B.C. | | | 1 |
 | KCS SD40-2 | Kansas City Southern Railway | | | 17 |
 | L&N SD40-2 | Louisville and Nashville Railroad | | | 2 |
 | MILW SD40-2 | Chicago, Milwaukee, St. Paul and Pacific Railroad | | | 12 |
 | MKT SD40-2 | Missouri-Kansas-Texas | | | 5 |
 | MMID SD40-2 | Maryland Midland Railway | | | 4 |
 | MMID SD40M-2 | Maryland Midland Railway | | | 1 |
 | MNA SD40-2 | Missouri and Northern Arkansas Railroad | | | 1 |
 | MP SD40-2 | Missouri Pacific | | | 15 |
 | MRL SD40-2 | Montana Rail Link | | | 1 |
 | MSE SD40-2 | Mississippi Export Railroad | | | 1 |
 | NECR SD40-2 | New England Central Railroad | | | 1 |
 | NS SD40-2 | Norfolk Southern Railway | | | 15 |
 | NW SD40-2 | Norfolk and Western Railway | | | 10 |
 | NYSW SD40-2 | New York, Susquehanna and Western Railway | | | 2 |
 | OVR SD40-2 | Ottawa Valley Railway | | | 0 |
 | OVR SD40-2 | Ottawa Valley Railway | | | 1 |
 | OWTX SD40-2 | Oneida and Western Railroad | | | 1 |
 | PAR SD40-2 | Pan Am Railways | | | 1 |
 | PVJR SD40-2 | Portland Vancouver Junction Railroad | | | 1 |
 | QNSL SD40-2 | Quebec North Shore and Labrador Railway | | | 1 |
 | RBMN SD40-2 | Reading Blue Mountain and Northern Railroad | | | 4 |
 | RCPE SD40-2 | Rapid City, Pierre and Eastern Railroad | | | 2 |
 | RJCP SD40-2 | R.J. Corman Railroad/Pennsylvania Lines | | | 2 |
 | RRC SD40-2 | RESPONDEK RAILROAD CORPORATION | RESPONDEK RAILROAD CORPORATION | | 1 |
 | SBD SD40-2 | Seaboard System Railroad | | | 2 |
 | SOO SD40-2 | Soo Line Railroad | | | 5 |
 | SOU SD40-2 | Southern Railway | | | 3 |
 | SRR SD40-2 | Swan Ranch Railroad | | | 1 |
 | TRC SD40-2 | Trona Railway | | | 2 |
 | UP SD40-2 | Union Pacific Railroad | | | 68 |
 | UP SD40N | Union Pacific Railroad | | | 18 |
 | UPY SD40N | Union Pacific Yard | | | 4 |
 | WE SD40-2 | Wheeling and Lake Erie Railway | | | 5 |
 | WRIX SD40-2 | Western Rail Inc. | | | 1 |
 | WSOR SD40-2 | Wisconsin and Southern Railroad | | | 2 |