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 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.

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They remained in service until 1945, and were all withdrawn and scrapped by 1946.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. 1 2 3 Dredge, James (1879). The Pennsylvania Railroad. London: Engineering magazine.
  2. 1 2 3 4 5 6 7 8 9 10 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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