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Pennsylvania classes D and Da
later classes G1 and G1a
United States | 1868 | 286 produced
No. 569 in April 1885 in Jersey City, New Jersey
No. 569 in April 1885 in Jersey City, New Jersey
collection Taylor Rush

For the transport of freight trains, the PRR had Baldwin build a class of ten-wheelers from 1868, which was one of the heaviest designs of this manufacturer at the time and achieved a very respectable number of units for its time. Baldwin made 241 between 1868 and 1873 and the PRR's own workshops added 45 more by 1875.

Since there wasn't much space between the bars of the bar frame, a narrow, deep firebox had to be accommodated. For this reason, the distance between the second and third driving axles was chosen to be significantly larger than that between the first and second, in order to be able to realize a greater length of the firebox. Since the grate area was still relatively modest for the size of the locomotive, good hard coal was used for firing. In order to avoid problems when running through curves with the large wheelbase, the first coupled axle was designed without wheel flanges

Between 1878 and 1882, 157 of the locomotives were converted to the Da class, which was to be used to haul heavy, slow trains. To ensure this, the diameter of the coupled wheels was reduced from 56 to 50 inches. At the same time, the service weight increased by about five tons. Other non-converted examples were instead sold to several smaller railway companies.

VariantDDa
General
Built1868-18751878-1882
ManufacturerBaldwin, AltoonaAltoona
Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase23 ft 8 in
Fixed wheelbase12 ft 5 in12 ft 5in
Total wheelbase45 ft 10 in
Service weight77,400 lbs82,500 lbs
Adhesive weight59,200 lbs57,620 lbs
Total weight128,800 lbs133,900 lbs
Axle load20,800 lbs20,570 lbs
Water capacity2,400 us gal
Fuel capacity8,000 lbs (coal)
Power
Power sourcesteam
Estimated power375 hp (280 kW)
Optimal speed18 mph16 mph
Starting effort13,524 lbf15,147 lbf
Power Plant
Driver diameter56 in50 in
Boiler pressure125 psi
Expansion typesimple
Cylinderstwo, 18 x 22 in
Boiler
Grate area14.5 sq ft
Firebox area96 sq ft
Tube heating area997 sq ft
Evaporative heating area1,093 sq ft
Total heating area1,093 sq ft
Calculated Values
steam locomotive
freight
last changed: 09/2022
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