Pennsylvania Railroad class D1

The Pennsylvania Railroad's steam locomotive class D1 (formerly Class A, pre-1895) comprised thirteen 4-4-0 locomotives for express passenger service, constructed at the railroad's own Altoona Works (now owned by Norfolk Southern) during 1868–1872.[3] They were the first standardized class of locomotives on the railroad and shared many parts with other standard classes.[1]

PRR D1 (then known as a class A) fitted with experimental Westinghouse air brake equipment during the trials of September 1869.
PRR D1
D1 #28
Type and origin
Power typeSteam
BuilderPRR Altoona Works
Build date1868–1872
Total produced13
Specifications
Configuration:
​
 • Whyte4-4-0
 • UIC2′B
Gauge4 ft 8+1⁄2 in (1,435 mm)
Leading dia.26 in (660 mm)[1]
Driver dia.68 in (1,727 mm)[1]
Wheelbase22 ft 5+5⁄8 in (6.85 m) (locomotive)
44 ft 11+5⁄8 in (13.706 m) (overall)[2]
Length54 ft 6.44 in (16.6228 m)[2]
Width9 ft 0.94 in (2.77 m)[2]
Height14 ft 8 in (4.47 m)[2]
Adhesive weight42,370 lb (19.2 tonnes)[2]
Loco weight77,700 lb (35.2 tonnes)[2]
Tender weight51,400 lb (23.3 tonnes)[2]
Total weight129,100 lb (58.6 tonnes)[2]
Tender typeEight-wheel with water scoop
Fuel typeSoft coal
Fuel capacity8,000 lb (3.6 tonnes)[2]
Water cap.2,400 US gal (9,100 L; 2,000 imp gal)[2]

The PRR was the first American railroad to adopt the Westinghouse air brake, the first tests of which were made in September 1869; Class A locomotives were among those fitted with air brake equipment for those earliest tests.[4][5]

They remained in service until 1945, and were all withdrawn and scrapped by 1946.

References
  1. Dredge, James (1879). The Pennsylvania Railroad. London: Engineering magazine.
  2. Pennsylvania Railroad. "Class D1 diagram". PRR.Railfan.net. Retrieved 2008-08-19.
  3. "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
  4. Staufer, Alvin F. & Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900–1957. Staufer. LCCN 62020878.
  5. Warner, Paul T. (1924). Motive Power Development on the Pennsylvania Railroad System. Philadelphia: Baldwin Locomotive Works.
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