The Alco S-5 (DL 421A) was a diesel-electric switcher locomotive rated at 800 horsepower (600 kW), that rode on two-axle trucks, having a B-B wheel arrangement.

Dec 22, 2024 · The S5 was the first switcher to employ Alco's very own prime mover, the model 251A, which was capable of producing 800 horsepower via 6 cylinders. As John Kirkland notes in his book, " The Diesel Builders: Volume Two," the S5 was essentially an experimental design.

The Alco S-5 (DL 421A) was a diesel-electric switcher locomotive rated at 800 horsepower (600 kW), that rode on two-axle trucks, having a B-B wheel arrangement. This was Alco 's second attempt to build a replacement 251-engined switcher to replace the 539-engined S-3 and S-4. Only seven were sold.

Nov 30, 2022 · Overview of the short production life of the Alco S5 locomotive before transition to the more popular S6 model

The Alco S-5 was a series of diesel-electric switcher locomotives that were built in 1954 by the American Locomotive Company (ALCO). These locomotives were rated at 800 horsepower (600 kW) with an end-cab design that incorporated the six-cylinder 251A engine.

Alco S5 The S5 prototype was Alco-Schenectady plant switcher #6 "Unlike the 244, Alco tested the 251 for several years before actually introducing it to customers. Development work on the 251 was begun when the 244 was still giving Alco customers alot of problems and was regarded as a handicap to Alco. Beside running the 251 on the Alco test ...

3 days ago · In 1954 American Locomotive Company unveiled a new line of diesel switching locomotives to replace the S-3 and S-4 locomotives previously offered. This new locomotive, the S-5, bore a striking resemblance to the earlier offerings with one major difference. Under the hood sat a brand new prime mover, the 251A engine.

Alco S-5 Data Sheet

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Only 2 built for Oliver Mining.