It used a naturally aspirated version of the 6-cylinder McIntosh and Seymour 538 engine, producing 660 hp (490 kW). The HH660 started production in ALCO's lineup in October 1938 43 examples were built until April 1940. Philadelphia, Bethlehem and New England Railroad Several HH900s were built with the 538T engine.Īmerican Locomotive Company (demonstrator unit) The 21 HH900 units were produced between March 1937 and January 1939, after which it was replaced by the McIntosh & Seymour 538T-engined HH1000. Both turbocharged models (HH900 and HH1000) needed a greater cooling capacity, and this was reflected in the larger bodyside radiator space of both models, which distinguishes them from the lower-powered HH600 and HH660.
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The HH900 was a 900 hp (670 kW) version of the HH series using a turbocharged version of the McIntosh & Seymour 531 engine. New York, New Haven and Hartford Railroad New York Central ( Boston and Albany Railroad) Renumbered 800–805 in 1948, to Penn Central same numbers Late versions of this locomotive used the 6-cylinder 538 engine.Īmerican Locomotive Company (demonstrators)ġ021 to Houdaille Construction Materials Co.ĭelaware, Lackawanna and Western Railroad The first-built units had sharp-edged front hood corners, but in 1934 ALCO employed industrial designer Otto Kuhler to clean up the appearance he curved the corners and recessed the headlight, and all subsequent HH series units were of this style until another restyling in 1938 where the nose was further rounded. The HH600 was powered by a 6-cylinder McIntosh & Seymour 531 engine of 600 hp (450 kW), and was built from July 1932 through May 1939 in all, 78 HH600s were constructed. The HH600 was nearly identical to the previous #0900 of the New Haven internally and mechanically, but it was clad in new bodywork, with a straight-sided hood and cab sides that came all the way to the frame. īuffalo Creek #43 HH660 owned and operated by the WNYRHS.
_atlas-hh660-decoder-install.jpg "alco hh660 railworks download")
Four nose-suspended GE-287-D traction motors in the trucks were geared at a ratio of 4.25:1 to the wheels the motors were cooled by electrically driven traction motor blowers. The locomotive was equipped with a four-stroke McIntosh & Seymour 531 straight-6 diesel engine, powering a General Electric GT551A1 main generator. This first unit was built in July 1931.ĭiesel-electric power transmission After a period of demonstration on a number of railroads, the unit was sold to the New York, New Haven and Hartford Railroad who numbered it as 0900, this number often being used to describe the locomotive, although the classification on the builder's data card was "404-OE-200". The sides of the locomotive's hood sloped outward from top to bottom, and brake equipment was exposed beneath the cab. The first HH series locomotive, ALCO demonstrator #600 was mechanically almost identical to the others, but the appearance differed. Original ALCO designations were either descriptive or based on the internal order/design number.Ī total of 177 of the HH series were produced this comprised one prototype and four production models of varying power outputs. Model designations such as HH600 are only semi-official. The "HH" name stood for "High Hood", a name ALCO came eventually to use in an official context, but originally an unofficial name. They were ALCO's first diesel switchers to enter true series production, and among the first land vehicles anywhere to use the revolutionary diesel-electric power transmission. The ALCO HH series were an early series of switcher diesel-electric locomotives built by the American Locomotive Company (ALCO) of Schenectady, New York between 19, when they were replaced by the S series the 660 hp (490 kW) S-1 and 1,000 hp (750 kW) S-2.
Portland Terminal Company HH600 #1004, photographed at Portland, Maine in 1968.Ĥ ft 8 + 1⁄ 2 in ( 1,435 mm) standard gauge
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