Pennsylvania Railroad class D7

4 ft 8+1⁄2 in (1,435 mm)Leading dia.30 in (762 mm) (D7)[2]
33 in (838 mm) (D7a)[3]Driver dia.68 in (1,727 mm) (D7)[2]
62 in (1,575 mm) (D7a)[3]Wheelbase22 ft 7+1⁄2 in (6.90 m)[2][3]Length58 ft 0.6 in (17.69 m)[3]Height14 ft 4 in (4.37 m)[3]Axle load32,650 lb (14.8 tonnes)[3]Adhesive weight56,700 lb (25.7 tonnes) (D7) [2]
58,700 lb (26.6 tonnes)[3]Loco weight93,500 lb (42.4 tonnes) (D7)[2]
96,330 lb (43.7 tonnes) (D7a)[3]Total weight160,880 lb (73.0 tonnes)[3]Fuel typeAnthracite coal[1]Fuel capacity12,000 lb (5.4 tonnes)[3]Water cap.2,400 US gal (9,100 L; 2,000 imp gal)[3]Firebox:​ • Grate area34.75 sq ft (3.23 m2)[3]Boiler pressure140 lbf/in2 (970 kPa)[3]Heating surface:​ • Firebox155 sq ft (14.40 m2)[3] • Tubes1,134 sq ft (105.35 m2)[3] • Total surface1,289 sq ft (119.75 m2)[3]Cylinders2[3]Cylinder size17 in × 24 in (432 mm × 610 mm)[3]Valve gearStephensonValve typeSlide valves
Performance figures
Tractive effort12,138 lbf (53.99 kN) (D7)
13,313 lbf (59.22 kN) (D6a)
Factor of adh.4.7 (D7) 4.4 (D7a)

Class D7 (formerly Class A (anthracite), pre-1895) on the Pennsylvania Railroad was a class of 4-4-0 steam locomotive.[4] Fifty-eight were built by the PRR's Altoona Works (now owned by Norfolk Southern) between 1882–1891 with 68 in (1.73 m) drivers, while sixty-one of class D7a were constructed with 62 in (1.57 m) drivers.[1]

The D7 was fundamentally an anthracite-burning version of the PRR D6, with a larger fire-grate in order to burn the slower-burning, harder coal.[5]

References

  1. ^ a b c d e "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
  2. ^ a b c d e Pennsylvania Railroad. "D7 Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
  3. ^ a b c d e f g h i j k l m n o p q r Pennsylvania Railroad. "D7a Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
  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.
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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: