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Pennsylvania class H6

H6sa No. 2552 in November 1931 in Logansport, Indiana

The various variants of the H6 formed the most numerous class of steam locomotives in the PRR. After the USATC S160, which had been developed for wartime use in Europe, they were also the most-built Consolidations. Th...

General

Property	Pennsylvania class H6 H6sa, sb H6 H6a H6b H6sa, sb Remove
Built	1920
Manufacturers	Altoona
Wheel arrangement	2-8-0 (Consolidation)
Gauge	1,435 mm (Standard gauge)

Dimensions and weights

Property	Pennsylvania class H6 H6sa, sb H6 H6a H6b H6sa, sb Remove
Length	20.09 m
Wheelbase	7.54 m
Rigid wheelbase	5.04 m
Total wheelbase	17.68 m
Service weight	90.1 t
Adhesive weight	80.7 t
Axle load	20.6 t
Total weight	153 t
Water capacity	27,255 l
Fuel capacity	12.7 t (coal)

Boiler

Property	Pennsylvania class H6 H6sa, sb H6 H6a H6b H6sa, sb Remove
Grate area	4.552 m²
Firebox surface	17.466 m²
Tube heating surface	190.08 m²
Evaporative heating surface	207.546 m²
Superheater surface	39.855 m²
Total heating surface	247.4 m²

Power plant

Property	Pennsylvania class H6 H6sa, sb H6 H6a H6b H6sa, sb Remove
Driver diameter	1,422 mm
Boiler pressure	13.4 bar
Expansion type	simple expansion
Cylinders	two, 584 x 711 mm

Power

Property	Pennsylvania class H6 H6sa, sb H6 H6a H6b H6sa, sb Remove
Power source	steam
Estimated power	1,268 kW (1,724 PS)
Top speed	97 km/h
Starting effort	195.0 kN

Calculated values

Property	Pennsylvania class H6 H6sa, sb H6 H6a H6b H6sa, sb Remove
Factor of adhesion	1 : 4.06
Optimal speed	40 km/h
Power-to-weight ratio	14.1 kW/t
Heating Surface Equivalent	374.6 m²
Cylinder volume/HSE	1 : 1,017.85
Adhesive weight/Total	1 : 1.12
Tractive force/Heating surface	1 : 16.46
Grate area/Heating surface	1 : 54.35
Firebox/Tube surface	1 : 10.88
Total/Superheater	1 : 5.21

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