The ALCO HH series was an early set of diesel switcher locomotives built by the American Locomotive Company (ALCO) of Schenectady, New York between 1931 and 1940, when they were replaced by the S series: the 660 hp (490 kW) S-1 and 1,000 hp (750 kW) S-2. 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.
Portland Terminal Company HH600 #1004, photographed at Portland, Maine in 1968.
The New Haven's Alco 600 in 1933.
6-cylinder McIntosh & Seymour engine on a flat car
Buffalo Creek #43 HH660 owned and operated by the WNYRHS. 2018 photo.
Diesel–electric powertrain
A diesel–electric transmission, or diesel–electric powertrain, is a transmission system for vehicles powered by diesel engines in road, rail, and marine transport. Diesel–electric transmission is based on petrol–electric transmission, a transmission system used for petrol engines.
This Metra EMD F40PHM-2 locomotive uses a diesel–electric transmission designed by Electro-Motive Diesel
Siemens Schottel azimuth thrusters
USCGC Healy uses a diesel–electric propulsion system designed by GEC-Alsthom
New Flyer Industries DE60LF diesel–electric bus with rooftop batteries
