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Pennsylvania classes H8, H9 and H10
United States | 1907
1,233 produced
H10s No. 8811, built for the Vandalia Railroad, in July 1935 in Peoria, Illinois
H10s No. 8811, built for the Vandalia Railroad, in July 1935 in Peoria, Illinois
J.O. Riley, collection Taylor Rush

From 1907 onwards, the PRR initially procured 540 Consolidations of classes H8 to H8c, which were still operated with saturated steam. In addition, 146 of them had already been built as H8sb or H8sc with superheaters. Most of the former were also soon superheated. From 1913 onwards, 274 H9s and 273 H10s followed, all of which had a superheater from the factory, most of which were similar to the superheated H8 and differed in the size of the ports in the valves. In addition, 312 H8s were rebuilt into H9s and 200 more H8s were rebuilt into H10s. Baldwin, the ALCO plants in Pittsburgh and Brooks, and the PRR Juniata shops in Altoona were involved in the production of the individual variants. The retirements began in 1933 and were completed by 1960.

VariantH8aH8sbH9sH10s
General
Built1907-19131913-19141913-1916
ManufacturerAltoona, ALCO, BaldwinALCO, Baldwin, LimaBaldwin, AltoonaALCO, Baldwin, Lima
Axle config2-8-0 (Consolidation) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase25 ft 10 in
Rigid wheelbase17 ft 0 1/2 in
Total wheelbase59 ft 4 ft62 ft 5 in62 ft 6 in62 ft 5 in
Service weight240,945 lbs252,500 lbs250,000 lbs249,500 lbs
Adhesive weight216,450 lbs225,000 lbs220,000 lbs226,900 lbs
Total weight399,945 lbs411,500 lbs389,000 lbs431,000 lbs
Axle load62,300 lbs61,000 lbs62,300 lbs60,000 lbs
Water capacity7,000 us gal9,000 us gal8,100 us gal
Fuel capacity25,000 lbs (coal)34,000 lbs (coal)
Boiler
Grate area55.1 sq ft
Firebox area192 sq ft211 sq ft
Tube heating area3,652 sq ft2,859 sq ft
Evaporative heating area3,844 sq ft3,070 sq ft
Superheater area613 sq ft
Total heating area3,844 sq ft3,683 sq ft
VariantH8aH8sbH9sH10s
Power Plant
Driver diameter62 in
Boiler pressure205 psi
Expansion typesimple
Cylinderstwo, 25 x 28 intwo, 26 x 28 in
Power
Power sourcesteam
Estimated power1,900 hp (1,417 kW)2,200 hp (1,641 kW)2,300 hp (1,715 kW)
Optimal speed25 mph26 mph28 mph
Starting effort49,183 lbf53,197 lbf
Calculated Values
steam locomotive
freight
last changed: 10/2023
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