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Pennsylvania Railroad class D2

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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)
30 in (762 mm) (D2a)
Driver dia.62 in (1,575 mm) (D2)
68 in (1,727 mm) (D2a)
Wheelbase22 ft 5+5⁄8 in (6.85 m)
Length54 ft 5.44 in (16.60 m)
Width9 ft 0.94 in (2.77 m)
Height14 ft 8 in (4.47 m) (D2)
14 ft 11 in (4.55 m) (D2a)
Adhesive weight52,500 lb (23.8 tonnes) (D2)
53,750 lb (24.4 tonnes) (D2a)
Loco weight80,500 lb (36.5 tonnes) (D2)
82,200 lb (37.3 tonnes) (D2a)
Tender weight51,400 lb (23.3 tonnes) (D2 & D2a)
Total weight131,900 lb (59.8 tonnes) (D2)
133,600 lb (60.6 tonnes)
Tender typeEight-wheel with water scoop
Fuel typeSoft coal
Fuel capacity8,000 lb (3.6 tonnes)
Water cap.2,400 US gal (9,100 L; 2,000 imp gal)

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. They were the second standardized class of locomotives on the railroad and shared many parts with other standard classes.

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.

References

  1. ^ Dredge, James (1879). The Pennsylvania Railroad. London: Engineering magazine.
  2. ^ Pennsylvania Railroad. "Class D2 diagram". PRR.Railfan.net. Retrieved 2008-08-19.
  3. ^ Pennsylvania Railroad. "Class D2a diagram". PRR.Railfan.net. Retrieved 2008-08-19.
  4. ^ "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.
Pennsylvania Railroad locomotives
   
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