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ALCO HH series

Milwaukee Road HH660 No. 983, which now stands in the Illinois Railway Museum

The HH series were the first diesel shunting locomotives that ALCO mass-produced in large numbers. They were also among the first land vehicles with a diesel-electric transmission. “HH” stood for “High Hood” while the...

	ALCO HH series Remove
Variant	HH600 HH600 HH660 HH900 HH1000
Built	1932-1939
Manufacturers	ALCO
Wheel arrangement	BoBo
Gauge	1435 mm
Length	13233 mm
Service mass	93495 kg
Top speed	64 km/h
Power
Engine	McIntosh & Seymour 531

General

Property	ALCO HH series HH600 HH600 HH660 HH900 HH1000 Remove
Built	1932-1939
Manufacturers	ALCO
Wheel arrangement	B-B
Gauge	1,435 mm

Dimensions and weights

Property	ALCO HH series HH600 HH600 HH660 HH900 HH1000 Remove
Length	13.23 m
Wheelbase	9.04 m
Service mass	93.5 t
Adhesion mass	93.5 t
Rigid wheelbase	2.44 m
Axle load	23.4 t

Power plant

Property	ALCO HH series HH600 HH600 HH660 HH900 HH1000 Remove
Engine	McIntosh & Seymour 531
Engine type	6-cyl. diesel

Power

Property	ALCO HH series HH600 HH600 HH660 HH900 HH1000 Remove
Power source	diesel-electric
Indicated power	447 kW (608 PS)
Top speed	64 km/h
Starting effort	266.0 kN

Calculated values

Property	ALCO HH series HH600 HH600 HH660 HH900 HH1000 Remove
Factor of adhesion	1 : 3.45
Power-to-weight ratio	4.8 kW/t
Adhesive weight/Total	1 : 1.00

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