# Baldwin VO-660

The Baldwin VO-660 was a diesel-electric switcher locomotive built by Baldwin Locomotive Works between April, 1939 and May, 1946. The 197,520–203,980 lb (89,600–92,500 kg) units were powered by a six-cylinder diesel engine rated at 660 horsepower (492 kW), and rode on two-axle AAR Type-A switcher trucks in a B-B wheel arrangement. 142 examples of this model were built for American railroads, along with the United States Navy. Baldwin replaced the VO-660 with the model DS-4-4-660 in 1946.
In the early 1960s the Reading Company sent all 10 of their VO-660s to General Motors Electro-Motive Division to have them rebuilt to SW900 specifications. These locomotives received new frames, cabs, and carbodies, and reused only the trucks and batteries from the VO-660's. Only four intact examples of the VO-660 are known to survive today. One was built as Baldwin 335, the first production VO-660. It was sold by the Altoona Railroaders Memorial Museum to SMS Lines to be repaired and put back into operation. SMS also owns the former Warner 11, which is being restored before being put into service. The others are Pickens Railway #2, built in 1946, and Wyandotte Terminal 103, at the Illinois Railway Museum, both of which are inoperable at the present time.

## Units produced

| Railroad | Quantity | Road numbers | Notes |
| Baldwin Locomotive Works (pre-production units) | 1 | 299 | Used as BLW plant switcher |
| Baldwin Locomotive Works (pre-production units) | 1 | 62300 | to Reading 60 |
| Baldwin Locomotive Works (demonstrator) | 1 | 335 | first production VO-660; to Standard Steel Division of Baldwin Locomotive Works 12, to Altoona Railroaders Museum, to SMS Rail Lines, under restoration to active service |
| Baldwin Locomotive Works (demonstrator) | 1 | 336 | to Elgin, Joliet and Eastern 270 |
| Baldwin Locomotive Works (demonstrator) | 1 | 337 | to Central of Georgia Railway |
| Akron and Barberton Belt Railroad | 1 | 25 | |
| American Smelting and Refining Company (ASARCO) | 4 | 1950–1953 | |
| American Steel and Wire Company | 3 | 1, 11, 23-1 | |
| Basic Magnesium, Inc. | 1 | 1000 | |
| Central Railroad of New Jersey | 4 | 1040–1043 | |
| Chicago and Eastern Illinois Railroad | 1 | 110 | |
| Chicago and North Western Railway | 10 | 1237–1246 | |
| Chicago, Milwaukee, St. Paul and Pacific Railroad (“Milwaukee Road”) | 1 | 1649 | Renumbered 1635, later renumbered 985 |
| Chicago, St. Paul, Minneapolis and Omaha Railway (“Omaha Road”) | 3 | 58, 59, 68 | |
| Denver and Rio Grande Western Railroad | 9 | 66–74 | |
| Elgin, Joliet and Eastern Railway | 2 | 271, 272 | |
| Francisco Sugar Company, (Cuba) | 1 | 45 | |
| Iowa Ordnance Plant | 1 | 2-100 | to US War Dept 7276 |
| Kansas City Southern Railway | 1 | 1150 | |
| La Salle and Bureau County Railroad | 1 | 6 | |
| Long Island Rail Road | 1 | 403 | |
| Louisville and Nashville Railroad | 4 | 20–23 | |
| Minneapolis, Northfield and Southern Railway | 1 | 600 | Renumbered 60 |
| Minnesota Western Railway | 1 | 1 | to MNS 1 |
| Missouri Pacific Railroad | 4 | 9009, 9010, 9012, 9026 | |
| Nashville, Chattanooga and St. Louis Railway | 1 | 10 | |
| New Orleans Public Belt Railroad | 3 | 41–43 | |
| New York Central Railroad | 12 | 501–502, 752–761 | 501–502 renumbered 750–751 |
| Northern Pacific Railway | 3 | 128–130 | Renumbered 650–652 |
| Patapsco and Back Rivers Railroad | 3 | 63–65 | Renumbered 301–303 |
| Pennsylvania Railroad | 12 | 5907–5909, 5932–5937, 5941–5943 | |
| Procter and Gamble | 1 | 125 | Used at Port Ivory, Staten Island, NY |
| Reading Company | 10 | 61–70 | |
| St. Louis-San Francisco Railway | 2 | 600–601 | |
| Seaboard Air Line Railroad | 1 | 1202 | |
| Singer Manufacturing Company | 1 | 2 | to Pickens Railway #2, stored out of service on line |
| Southern Pacific Company | 2 | 1021–1022 | |
| Southern Railway | 1 | DS2005 | |
| Terminal Railroad Association of St. Louis | 4 | 531–534 | |
| Union Terminal Railway of Memphis (Missouri Pacific Railroad) | 2 | 9090–9091 | |
| United States Navy | 6 | 10, 11, 15, 16, 18, 31 | |
| Upper Merion and Plymouth Railroad | 2 | 51–52 | |
| Wabash Railroad | 1 | 200 | |
| Warner Company | 1 | 11 | to New Hope & Ivyland 395, to SMS Rail Lines 11; under restoration |
| Western Maryland Railway | 4 | 101, 103–105 | |
| Westinghouse Electric and Manufacturing Company | 1 | 10 | |
| Wyandotte Terminal Railroad | 3 | 101–103 | 103 preserved at Illinois Railway Museum |
| Youngstown Sheet and Tube | 8 | 600–607 | |
| Total | 143 | | |