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Pennsylvania Railroad class D7

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Pennsylvania Railroad D7
PRR D7a #953 in its builders' portrait
Type and origin
Power typeSteam
BuilderPRR Altoona Works
Build date1882–1891
Total produced58 D7, 61 D7a
Specifications
Configuration:
​
 • Whyte4-4-0
 • UIC2′B
Gauge4 ft 8+1⁄2 in (1,435 mm)
Leading dia.30 in (762 mm) (D7)
33 in (838 mm) (D7a)
Driver dia.68 in (1,727 mm) (D7)
62 in (1,575 mm) (D7a)
Wheelbase22 ft 7+1⁄2 in (6.90 m)
Length58 ft 0.6 in (17.69 m)
Height14 ft 4 in (4.37 m)
Axle load32,650 lb (14.8 tonnes)
Adhesive weight56,700 lb (25.7 tonnes) (D7)
58,700 lb (26.6 tonnes)
Loco weight93,500 lb (42.4 tonnes) (D7)
96,330 lb (43.7 tonnes) (D7a)
Total weight160,880 lb (73.0 tonnes)
Fuel typeAnthracite coal
Fuel capacity12,000 lb (5.4 tonnes)
Water cap.2,400 US gal (9,100 L; 2,000 imp gal)
Firebox:​
 • Grate area34.75 sq ft (3.23 m)
Boiler pressure140 lbf/in (970 kPa)
Heating surface:​
 • Firebox155 sq ft (14.40 m)
 • Tubes1,134 sq ft (105.35 m)
 • Total surface1,289 sq ft (119.75 m)
Cylinders2
Cylinder size17 in × 24 in (432 mm × 610 mm)
Valve gearStephenson
Valve 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. 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.

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.

References

  1. ^ "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
  2. ^ Pennsylvania Railroad. "D7 Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
  3. ^ 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.
Pennsylvania Railroad locomotives
   
A (0-4-0):
B (0-6-0):
C (0-8-0):
D (4-4-0):
E (4-4-2):
F (2-6-0):
G (4-6-0):
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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:
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