The reference for locomotives and railcars
ALCO S-1 to S-6
United States | 1940 | 3,275 produced
Works photo of Louisville and Nashville No. 2225, an S-4
Works photo of Louisville and Nashville No. 2225, an S-4
VariantS-1, S-3S-2, S-4S-5S-6
ManufacturerALCO, Montreal Locomotive Works
Axle configB-B 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length44 ft 5 in45 ft 5 in
Wheelbase30 ft
Fixed wheelbase8 ft
Service weight210,000 lbs229,700 lbs230,000 lbs
Adhesive weight210,000 lbs229,700 lbs230,000 lbs
Axle load52,500 lbs57,425 lbs57,500 lbs
Power sourcediesel-electric
Top speed60 mph
Starting effort57,500 lbf69,000 lbf57,500 lbf61,500 lbf
EngineALCO 539 6LALCO 251A
Engine type6-cyl. diesel
Fuel635 us gal (diesel)
Engine output600 hp (447 kW)1,000 hp (746 kW)800 hp (597 kW)900 hp (671 kW)
Power Plant
Calculated Values
diesel locomotive
last changed: 09 2023

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