The ALCO S-2 and S-4 are 1,000-horsepower (746 kW) diesel electric switcher locomotives produced by ALCO and Canadian licensee Montreal Locomotive Works (MLW). [1] Powered by turbocharged, 6-cylinder ALCO 539 diesel engines, the two locomotives differed mainly in their trucks: the S-2 had ALCO "Blunt" trucks; the S-4, AAR type A switcher trucks ...

Jan 9, 2025 · The S2 was the second switcher model Alco produced although it was constructed at the same time as the earlier S1. One of the significant differences between the two models was the increased horsepower of the S2, which was a 40% increase over the previous design.

Sources of information: Extra 2200 South, Diesel Era, The Short Line and The Canadian Trackside Guide. Model: ?

The S-series rode on Alco’s own Blunt trucks, named for the in-house engineer who designed them to negotiate the tight turns and less-than-perfect track often found on switching assignments. Introduced just in time for World War II’s crush of traffic, the S-2 became a best-seller.

An ALCO S-2 Roster will show these occupied 4 distinct number series, in 3 different classes. Differences were limited to minor mechanical things and marginal variation in weight. Some received radio equipment and train indicators, none were ever MU capable.

ALCO S-2. One of the most popular switching locomotives in North America during the 1940s and 50s was the ALCO-GE Model S-2 (specification E1540). 2502 of these thousand-horsepower units were built from April 1940 through December 1949.

Tractive Effort (starting) 69,000 @ 30% (S-2) and 72,400 lbs @ 30% (S-4) Tractive Effort (continuous): 29,200 lbs @ 6 mph / 34,000 @ 8 mph Multiple Unit Capability: Yes

The ALCO S-2 and S-4 are 1,000-horsepower (746 kW) diesel electric switcher locomotives produced by ALCO and Canadian licensee Montreal Locomotive Works (MLW). Powered by turbocharged, 6-cylinder ALCO 539 diesel engines, the two locomotives differed mainly in their trucks: the S-2 had ALCO "Blunt" trucks; the S-4, AAR type A switcher trucks.

All S-2s were painted black with yellow lining/lettering, and all were off the roster by 1969. None were ever painted in the blue and grey lightning stripe livery. Purchased by Relco in March 1969 and renumbered to RE1008. It was used by Chevron in Baton Rouge, LA from 1971 to 1980. It was then sent to Minooka for a rebuild.

Jan 1, 2023 · The ALCO S2 and S4 were 1,000 horsepower (746 kW) diesel electric switchers produced by ALCO and Canadian licensee Montreal Locomotive Works (MLW). The two locomotives differed only in trucks, with the S-2 using ALCO "Blunt" trucks, and the S-4 using AAR type A switcher trucks.