Pennsylvania Railroad class D2

4 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 scoopFuel typeSoft coalFuel 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. ^ 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 D2 diagram". PRR.Railfan.net. Retrieved 2008-08-19.
  3. ^ a b c d e f g h i j Pennsylvania Railroad. "Class D2a diagram". PRR.Railfan.net. Retrieved 2008-08-19.
  4. ^ a b "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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Pennsylvania Railroad locomotives
   
A (0-4-0):
B (0-6-0):
C (0-8-0):
  • C1
  • C29
  • C30
  • C31
D (4-4-0):
E (4-4-2):
F (2-6-0):
  • F1
  • F2
  • F3
  • F21
  • F22
  • F23
  • F24
  • F25
  • F26
  • F27
  • F30
  • F31
  • F61
G (4-6-0):
  • G1
  • G2
  • G3
  • G4
  • G5
  • G6
  • G53
H (2-8-0):
I (2-10-0):
J (2-6-2 and 2-10-4):
K (4-6-2):
L (2-8-2):
M (4-8-2):
N (2-10-2):
O (4-4-4):
P (4-6-4):
Q (4-6-4-4 and 4-4-6-4):
R (4-8-4):
S (6-4-4-6 and 6-8-6):
T (4-4-4-4):
Articulated steam locomotives:
Articulated electric locomotives:
Non-standard: