Baldwin S-12

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Baldwin S-12
Power type Diesel-electric
Builder Baldwin Locomotive Works
Model S-12
Build date 1951 – 1956
Total production 452
Gauge 4 ft 8½ in (1,435 mm)
Engine type 606A
Cylinders 6
Power output 1,200 hp
Disposition 6 are preserved, the rest are scrapped

The Baldwin S-12 was a 1,200-horsepower diesel-electric locomotive intended for use in yard switching. The Baldwin Locomotive Works produced a total of 452 units between 1951 and 1956. Utilizing the powerful 6-cylinder 606A diesel engine prime mover, S-12s were known for their "lugging" power, despite being temperamental.

At least six intact examples of the S-12 are known to survive today at railroad museums. SMS Lines operates S-12 #301 at the Penn Warner industrial park at Morrisville, PA. One unit that was converted from a Baldwin DS-4-4-1000 is in service today on the Whitewater Valley Railroad.

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