ALCO S-6

The Alco S-6 (specification DL 430) was a series of diesel-electric switcher locomotives built by the American Locomotive Co. of Schenectady, New York; 126 units in total were built between May 1955 and December 1960.
The S-6 was an improved version and visually indistinguishable from the preceding model S-5; the S-6 used an ALCO 251A or 251B prime mover rated at 900 horsepower (670 kW), and rode on two-axle AAR trucks, giving a B-B wheel arrangement. ALCO produced a cow-calf variant for the Oliver Iron Mining Company designated SB-8/SSB-9.
As of 2019, several S6 locomotives remain operating at tourist railroads and industrial yards.
==Trivia==
*In Back to the Future Part III, two S-6 locomotives #7, and #9 destroyed the DeLorean time machine, when it returned to 1985. After filming Back to the Future Part III, the two S-6 locomotive were sold to the Fillmore and Western Railway where they reside today.
*They also appear in the film "Who's That Girl?", and even have appearances in the "Ghost Dad" movie while wearing the same colors from Back to the Future Part III.
*The Alco S6 was the sixth model of switcher series the company produced and debuted in 1955 and built until 1960.
==Gallery==
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ALCO S-6.jpg|SP No. 1231 at El Centro, California, in 1970.
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Category:Diesel locomotives
Category:ALCO locomotives
Category:Southern Pacific locomotives
Category:Northern Pacific locomotives
Category:Four-axled diesel locomotives
Category:American locomotives
Category:Switcher locomotives
Category:Locomotives
Category:ALCO S-6
Category:ALCO diesel locomotives
Category:B-B locomotives
Category:Standard gauge locomotives
Category:Standard gauge locomotives of the United States
Category:Diesel-electric locomotives
Category:Western Maryland locomotives