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Pennsylvania class D
United States | 1852 | 11 produced
Schematic drawing as built
Schematic drawing as built
Locomotive Engineering, February 1898

In principle, these locomotives can be described as the first Moguls, but the leading axle was fixed in the frame. The coupled axles with small wheel diameters were well spaced within the frame. The tender already had four axles, but only the first two were in a movable bogie and the rear ones were fixed in the frame.

After the rebuild to a 4-6-0
After the rebuild to a 4-6-0
Railway and Locomotive Engineering, January 1905

Although the locomotives were generally described as being a good design, the smooth running was apparently not entirely convincing. This is the way to explain why the chassis was later rebuilt. Some locomotives were converted to 4-4-0 with larger wheels. A third coupled axle was installed later again, resulting in a 4-6-0 wheel arrangement. They were scrapped in the late 1860s.

General
Built1852-1853
ManufacturerBaldwin
Axle config2-6-0 (Mogul) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase18 ft
Fixed wheelbase13 ft
Service weight65,500 lbs
Adhesive weight46,700 lbs
Axle load18,800 lbs
Power
Starting effort10,328 lbf
Power Plant
Driver diameter44 in
Boiler pressure75 psi
Cylinderstwo, 18 x 22 in
Boiler
Grate area14.1 sq ft
Calculated Values
steam locomotive
freight
last changed: 03/2023
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