| Baldwin VO-660 | |
| Powertype: | Diesel-electric |
| Builder: | Baldwin Locomotive Works |
| Builddate: | April 1939 – May 1946 |
| Totalproduction: | 142 |
| Buildmodel: | VO-660 |
| Aarwheels: | B-B |
| Length: | 48feet |
| Locoweight: | 197520- |
| Primemover: | De La Verne VO |
| Rpmrange: | 625 rpm max. |
| Enginetype: | Straight-6 Four-stroke diesel |
| Aspiration: | Normally aspirated, solid fuel injection |
| Displacement: | 1979cuin per cylinder 11874cuin total |
| Cylindercount: | 6 |
| Cylindersize: | 12.75x |
| Transmission: | Electric |
| Generator: | DC generator |
| Tractionmotors: | DC traction motors |
| Poweroutput: | 660hp |
| Tractiveeffort: | 49380- |
| Locale: | North America, Cuba |
| Locobrakes: | Straight air |
| Trainbrakes: | Air |
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.[1] 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.
| Railroad | Quantity | Road numbers | Notes | |
|---|---|---|---|---|
| Baldwin Locomotive Works (pre-production units) | 1 | 299 | Used as BLW plant switcher | |
| 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 | |
| 1 | 336 | to Elgin, Joliet and Eastern 270 | ||
| 1 | 337 | to Central of Georgia Railway | ||
| 1 | 25 | |||
| American Smelting and Refining Company (ASARCO) | 4 | 1950–1953 | ||
| 3 | 1, 11, 23-1 | |||
| 1 | 1000 | |||
| 4 | 1040–1043 | |||
| 1 | 110 | |||
| 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 | ||
| 9 | 66–74 | |||
| 2 | 271, 272 | |||
| Francisco Sugar Company, (Cuba) | 1 | 45 | ||
| 1 | 2-100 | to US War Dept 7276 | ||
| 1 | 1150 | |||
| 1 | 6 | |||
| 1 | 403 | |||
| 4 | 20–23 | |||
| 1 | 600 | Renumbered 60 | ||
| 1 | 1 | to MNS 1 | ||
| 4 | 9009, 9010, 9012, 9026 | |||
| 1 | 10 | |||
| 3 | 41–43 | |||
| 12 | 501–502, 752–761 | 501–502 renumbered 750–751 | ||
| 3 | 128–130 | Renumbered 650–652 | ||
| 3 | 63–65 | Renumbered 301–303 | ||
| 12 | 5907–5909, 5932–5937, 5941–5943 | |||
| 1 | 125 | Used at Port Ivory, Staten Island, NY | ||
| 10 | 61–70 | |||
| 2 | 600–601 | |||
| 1 | 1202 | |||
| 1 | 2 | to Pickens Railway #2, stored out of service on line | ||
| 2 | 1021–1022 | |||
| 1 | DS2005 | |||
| 4 | 531–534 | |||
| Union Terminal Railway of Memphis (Missouri Pacific Railroad) | 2 | 9090–9091 | ||
| 6 | 10, 11, 15, 16, 18, 31 | |||
| 2 | 51–52 | |||
| 1 | 200 | |||
| 1 | 11 | to New Hope & Ivyland 395, to SMS Rail Lines 11; under restoration | ||
| 4 | 101, 103–105 | |||
| 1 | 10 | |||
| 3 | 101–103 | 103 preserved at Illinois Railway Museum | ||
| 8 | 600–607 | |||
| Total | 143 |
