McIntosh & Seymour 531

The McIntosh & Seymour 531 was a diesel prime mover built by McIntosh & Seymour for use in railroad locomotives built by its parent company, the American Locomotive Company (Alco).

The 531 engine was designed and introduced in 1931.[1] It was a six cylinder engine, with a bore of 12.5 inches (32 cm) and a stroke of 13 inches (33 cm).[1] It was produced in naturally aspirated and turbocharged variants, making 600 and 900 horsepower, respectively.[1] It was primarily used in Alco's line of HH series switcher locomotives, as well as the Rebel passenger trains.[2] It was replaced by the 538 engine, which had a similar output as the 531 but with upgraded components.[2]

References

Notes
  1. Boyd, p. 5
  2. Boyd, p. 11

Bibliography
  • Boyd, Jim (2000). Passenger Alcos In Color. Scotch Plains, NJ: Morning Sun Books. p. 5. ISBN 1-58248-029-X.
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