# Baldwin DS-4-4-1000

The Baldwin DS-4-4-1000 were two models of four-axle 1,000 horsepower (746 kW) diesel–electric switcher locomotives built by the Baldwin Locomotive Works between 1946 and 1951. The first models (56 locomotives) were powered by an 8-cylinder normally aspirated prime mover, but from 1948, a change was made to the second model powered by a 6-cylinder turbocharged engine. These two models replaced the VO-1000 in Baldwin's catalogue, and were in turn replaced by the S-12 in 1951.

## Original owners
### 608NA (Normally Aspirated) engine

| Railroad | Quantity | Road numbers | Notes |
| Belt Railway of Chicago | 1 | 405 | |
| Copper Range Railroad | 2 | 100–101 | |
| Detroit Terminal Railroad | 1 | 103 | |
| Erie Railroad | 2* | 600–601 | |
| Missouri-Kansas-Texas Railroad | 11 | 1000–1010 | renumbered 22–32 in 1960; rebuilt by EMD with 1000-hp 12-567C engines between February 1959 and April 1960 |
| New York, Chicago and St. Louis Railroad ("Nickel Plate Road") | 2 | 100–101 | |
| Norfolk Southern Railway | 2 | 1001–1002 | |
| Reading Company | 14* | 26–39 | |
| St. Louis Southwestern Railway ("Cotton Belt") | 5 | 1023–1027 | |
| Seaboard Air Line Railroad | 8* | 1417–1424 | |
| U.S. Steel, Geneva Steel Division | 6* | 21–26 | |
| Western Maryland Railway | 2 | 133–134 | |
| Total | 56 | | |

### 606SC (Turbocharged) engine

| Railroad | Quantity | Road numbers | Notes |
| Akron and Barberton Belt Railroad | 1 | 26 | |
| American Smelting and Refining Company | 2 | 101–102 | |
| Atchison, Topeka and Santa Fe Railway | 41 | 2200 (second), 2260–2299 | |
| Atlanta and West Point Rail Road | 2 | 676–677 | |
| Baldwin Locomotive Works (test) | 1 | 100DF | Dual Fuel experiment with Bunker C Oil and Diesel, rebuilt to standard specification and sold to Patapsco and Back Rivers Railroad #335 |
| Baltimore and Ohio Railroad | 49 | 376–399, 438–462 | renumbered 9225–9273 |
| Bessemer and Lake Erie Railroad | 1 | 282 | to Geneva Steel #38 |
| Calumet and Hecla Mining Company | 2 | 201–202 | to Escanaba and Lake Superior |
| Canadian Pacific Railway | 11 | 7065–7075 | built by Baldwin Locomotive Works; 1 preserved in Toronto (7069) |
| Central of Georgia Railway | 2 | 36–37 | |
| Central Railroad of Pennsylvania (Central Railroad of New Jersey) | 3 | 1073–1075 | |
| Chicago and North Western Railway | 5 | 1018–1022 | |
| Chicago Great Western Railway | 10 | 32–41 | |
| Chicago, Milwaukee, St. Paul and Pacific Railroad ("Milwaukee Road") | 10 | 1692–1697, 1901–1904 | renumbered 940–949 |
| Chicago, St. Paul, Minneapolis and Omaha Railway ("Omaha Road") | 2 | 99–100 | |
| Erie Railroad | 15* | 602–616 | |
| Georgia Railroad | 1 | 921 | |
| Ironton Railroad | 2 | 750–751 | 750 to Patapsco and Back Rivers #348; 751 to Conrail #8354 |
| Kentucky and Indiana Terminal Railroad | 2 | 53–54 | |
| Lehigh Valley Railroad | 8 | 140–148 | |
| Long Island Rail Road | 1 | 450 | |
| Minneapolis, St. Paul and Sault Ste. Marie Railroad ("Soo Line") | 2 | 311–312 | |
| Missouri Pacific Railroad | 17 | 9120–9127, 9133–9141 | renumbered 1066–1073, 1074–1082 |
| Missouri Pacific Railroad (St. Louis, Brownsville and Mexico Railway) | 8 | 9148–9149, 9162–9167 | renumbered 1083, —, 1092–1097 |
| Oakland Terminal Railway | 1 | 101 | |
| Oliver Iron Mining Company | 5 | 928–932 | |
| Patapsco and Back Rivers Railroad | 8 | 337–344 | |
| Pennsylvania Railroad | 136 | 5550–5590, 5968–5979, 9050–9079, 9122–9275, 9434 | PRR Class BS-10a |
| Reading Company | 30* | 700–729 | |
| St. Louis-San Francisco Railway ("Frisco") | 4 | 238–241 | |
| Seaboard Air Line Railroad | 27* | 1435–1461 | to Seaboard Coast Line Railroad #51–73 |
| Southern Railway | 5 | 2285–2289 | |
| Southern Pacific Company | 10 | 1393–1402 | |
| Terminal Railroad Association of St. Louis | 2 | 602–603 | |
| Union Pacific Railroad | 5 | 1206–1210 | |
| United States Army Corps of Engineers | 2 | L-4, W8380 | |
| U.S. Steel, Carnegie-Illinois Steel Division | 3 | 74–76 | |
| U.S. Steel, Geneva Steel Division | 6* | 27–32 | |
| Wabash Railroad | 1 | 304 | rebuilt as calf (without a cab) in 1961 after collision damage |
| Western Railway of Alabama | 1 | 630 | |
| Total | 446 | | |
*Ordered Both 608NA & 606SC Models