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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	HH900 HH600 HH660 HH900 HH1000
Built	1937-1939
Manufacturers	ALCO
Wheel arrangement	BoBo
Gauge	1435 mm
Length	13786 mm
Service mass	104326 kg
Top speed	97 km/h
Power
Engine	McIntosh & Seymour 531T

General

Property	ALCO HH series HH900 HH600 HH660 HH900 HH1000 Remove
Built	1937-1939
Manufacturers	ALCO
Wheel arrangement	B-B
Gauge	1,435 mm

Dimensions and weights

Property	ALCO HH series HH900 HH600 HH660 HH900 HH1000 Remove
Length	13.79 m
Wheelbase	9.22 m
Service mass	104.3 t
Adhesion mass	104.3 t
Rigid wheelbase	2.44 m
Axle load	26.1 t

Power plant

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

Power

Property	ALCO HH series HH900 HH600 HH660 HH900 HH1000 Remove
Power source	diesel-electric
Indicated power	671 kW (912 PS)
Top speed	97 km/h
Starting effort	322.0 kN

Calculated values

Property	ALCO HH series HH900 HH600 HH660 HH900 HH1000 Remove
Factor of adhesion	1 : 3.18
Power-to-weight ratio	6.4 kW/t
Adhesive weight/Total	1 : 1.00

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