PRR D2 & D2a
Class B A #138 (later class D2a)
Type and origin
Power typeSteam
BuilderPRR Altoona Works
Build date1868–1872 (D2);
1881–1882 (D2a)
Total produced20 (D2); 45 (D2a)
Specifications
Configuration:
​
 • Whyte4-4-0
 • UIC2′B
Gauge4 ft 8+1⁄2 in (1,435 mm)
Leading dia.28 in (711 mm) (D2)[1]
30 in (762 mm) (D2a)[2]
Driver dia.62 in (1,575 mm) (D2)[1]
68 in (1,727 mm) (D2a)[2]
Wheelbase22 ft 5+5⁄8 in (6.85 m)[2][3]
Length54 ft 5.44 in (16.60 m)[2][3]
Width9 ft 0.94 in (2.77 m)[2][3]
Height14 ft 8 in (4.47 m) (D2)[3]
14 ft 11 in (4.55 m) (D2a)[2]
Adhesive weight52,500 lb (23.8 tonnes) (D2)[3]
53,750 lb (24.4 tonnes) (D2a)[2]
Loco weight80,500 lb (36.5 tonnes) (D2)[3]
82,200 lb (37.3 tonnes) (D2a)[2]
Tender weight51,400 lb (23.3 tonnes) (D2 & D2a)[2][3]
Total weight131,900 lb (59.8 tonnes) (D2)[3]
133,600 lb (60.6 tonnes)[2]
Tender typeEight-wheel with water scoop
Fuel typeSoft coal
Fuel capacity8,000 lb (3.6 tonnes)[3]
Water cap.2,400 US gal (9,100 L; 2,000 imp gal)[3]

The Pennsylvania Railroad's steam locomotive class D2 (formerly Class B, pre-1895) comprised twenty 4-4-0 locomotives intended for mountain passenger helper service, constructed at the railroad's own Altoona Works (now owned by Norfolk Southern) during 1869–1880.[4] They were the second standardized class of locomotives on the railroad and shared many parts with other standard classes.[1]

This design differed from the Class A (later D1) mainly in its smaller drivers for greater tractive effort in mountainous terrain. Like all the early standardized 4-4-0s on the PRR, the Class B had a wagon-top boiler with steam dome and a firebox between the two driving axles.

In 1881, the PRR took the Class B design and modified it to produce more locomotives for express passenger service, with 68-inch (1,727 mm) drivers like the earlier Class A. These new locomotives were designated Class B A, and were classified as D2a in the post-1895 scheme; forty-five of them were constructed.[4][5]

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 D2 diagram". PRR.Railfan.net. Retrieved 2008-08-19.
  3. 1 2 3 4 5 6 7 8 9 10 Pennsylvania Railroad. "Class D2a diagram". PRR.Railfan.net. Retrieved 2008-08-19.
  4. 1 2 "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
  5. ↑ Warner, Paul T. (1924). Motive Power Development on the Pennsylvania Railroad System. Philadelphia: Baldwin Locomotive Works.
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