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PRR D1 28.jpg
D1 #28
Type and origin
Power type Steam
Builder PRR Altoona Works
Build date 1868–1872
Total produced 13
Configuration 4-4-0
UIC class 2′B
Gauge 4 ft 8 12 in (1,435 mm)
Leading dia. 26 in (660 mm)[1]
Driver dia. 68 in (1,727 mm)[1]
Wheelbase 22 ft 5 58 in (6.85 m) (locomotive)
44 ft 11 58 in (13.706 m) (overall)[2]
Length 54 ft 6.44 in (16.6228 m)[2]
Width 9 ft 0.94 in (2.77 m)[2]
Height 14 ft 8 in (4.47 m)[2]
Adhesive weight 42,370 lb (19.2 tonnes)[2]
Loco weight 77,700 lb (35.2 tonnes)[2]
Tender weight 51,400 lb (23.3 tonnes)[2]
Total weight 129,100 lb (58.6 tonnes)[2]
Tender type Eight-wheel with water scoop
Fuel type Soft coal
Fuel capacity 8,000 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 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 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]


  1. ^ a b c Dredge, James (1879). The Pennsylvania Railroad. London: Engineering magazine. 
  2. ^ a b c d e f g h i j Pennsylvania Railroad. "Class D1 diagram". 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.