The Alco S-6 (specification DL 430) was a diesel–electric switcher locomotive constructed by ALCO of Schenectady, New York; a total of 126 locomotives were built between May 1955 and December 1960. The S-6 was an improved version of the earlier S-5.

Dec 22, 2024 · The S6, up to that time, would prove to be American Locomotive's least successful switcher design with fewer than 130 purchased and none were ultimately built by the Montreal Locomotive Works. The model was based from Alco's custom S5 locomotive built exclusively for the Boston & Maine Railroad, which had asked for a switcher with a bit less ...

The Alco S6 was a diesel-electric switching locomotive, an updated version of the earlier S-5 model. A total of 126 were built at Alco's Schenectady, New York plant between 1955 and 1960. They were powered by a four-stroke diesel engine that gave them a maximum output of 900 horsepower and a top speed of 60 m.p.h.

The Alco S-6 (specification DL 430) was a diesel-electric switcher locomotive constructed by ALCO of Schenectady, New York; a total of 126 locomotives were built between May 1955 and December 1960. The S-6 was an improved version of the earlier S-5.

The American Locomotive Company (ALCO), based in Schenectady, New York, United States produced a wide range of diesel-electric locomotives from its opening in 1901 until it ceased manufacture in 1969.

Occasionally four GE287 traction motors, from trade-in units, would be installed rather than GE731s.

Alco Reference #1 by Bob Liljestrand Brotherhood of Locomotive Firemen and Enginemen Magazine, October 1953

Alco S5, S6, SSB9 - Original Owners. by Robert Sarberenyi. S5: 8 US; S6: 93 US, 33 Mexico; SSB9: 2 US

Between 1955 and 1956 Espee receieved 70 Alco S-6 switchers. Two distinct varieties were delivered, #1033-1090 (later #1200-1257) were used as switcher, transfer and branchline units if photo captions are anything to go by.

It is indeed an Alco S6, ex Southern Pacific judging by the light package. This was one of Alco's last switcher models and only the SP really went for it. They bought 70 of the 126 examples built. I can think of about 4-5 examples that still exist in California, including one at PLA in Niles Canyon. Z