page_title: ALCO RSD-15
hierarchical_section_title: ALCO RSD-15
caption_attribution_description: Green Bay and Western Railroad 2407, an ALCO RSD-15, at the Illinois Railway Museum
context_page_description: The Alco RSD-15 was a diesel-electric locomotive of the road switcher type built by the American Locomotive Company of Schenectady, New York between August 1956 and June 1960, during which time 75 locomotives were produced. The RSD-15 was powered by an Alco 251 16-cylinder four-cycle V-type prime mover rated at 2,400 horsepower; it superseded the almost identical Alco 244-engined RSD-7, and was catalogued alongside the similar but smaller 1,800 hp RSD-12, powered by a 12-cylinder 251-model V-type diesel engine.
  The locomotive rode on a pair of three-axle Trimount trucks with all axles powered by General Electric model 752 traction motors. These trucks have an asymmetrical axle spacing because of the positioning of the traction motors. The six-motor design allowed higher tractive effort at lower speeds than an otherwise similar four-motor design.
  The RSD-15 could be ordered with either a high or low short hood; railfans dubbed the low short hood version "Alligators", due to their unusually long low noses.
context_section_description: The Alco RSD-15 was a diesel-electric locomotive of the road switcher type built by the American Locomotive Company of Schenectady, New York between August 1956 and June 1960, during which time 75 locomotives were produced.  The RSD-15 was powered by an Alco 251 16-cylinder four-cycle V-type prime mover rated at 2,400 horsepower (1.79 MW); it superseded the almost identical Alco 244-engined RSD-7, and was catalogued alongside the similar but smaller 1,800 hp (1.34 MW) RSD-12, powered by a 12-cylinder 251-model V-type diesel engine.
  The locomotive rode on a pair of three-axle Trimount trucks with all axles powered by General Electric model 752 traction motors.  These trucks have an asymmetrical axle spacing because of the positioning of the traction motors.  The six-motor design allowed higher tractive effort at lower speeds than an otherwise similar four-motor design.
  The RSD-15 could be ordered with either a high or low short hood; railfans dubbed the low short hood version "Alligators", due to their unusually long low noses.
caption: Green Bay and Western 2407, preserved at the Illinois Railway Museum
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