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] Wheelbase 22 ft 7+1⁄2 in (6.90 m)[2][3] Length 58 ft 0.6 in (17.69 m)[3] Height 14 ft 4 in (4.37 m)[3] Axle load 32,650 lb (14.8 tonnes)[3] Adhesive weight 56,700 lb (25.7 tonnes) (D7) [2]
58,700 lb (26.6 tonnes)[3] Loco weight 93,500 lb (42.4 tonnes) (D7)[2]
96,330 lb (43.7 tonnes) (D7a)[3] Total weight 160,880 lb (73.0 tonnes)[3] Fuel type Anthracite coal[1] Fuel capacity 12,000 lb (5.4 tonnes)[3] Water cap. 2,400 US gal (9,100 L; 2,000 imp gal)[3] Firebox: • Grate area 34.75 sq ft (3.23 m2)[3] Boiler pressure 140 lbf/in2 (970 kPa)[3] Heating surface: • Firebox 155 sq ft (14.40 m2)[3] • Tubes 1,134 sq ft (105.35 m2)[3] • Total surface 1,289 sq ft (119.75 m2)[3] Cylinders 2[3] Cylinder size 17 in × 24 in (432 mm × 610 mm)[3] Valve gear Stephenson Valve type Slide valves
33 in (838 mm) (D7a)[3]
62 in (1,575 mm) (D7a)[3]
58,700 lb (26.6 tonnes)[3]
96,330 lb (43.7 tonnes) (D7a)[3]
Performance figures | |
---|---|
Tractive effort | 12,138 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
- ^ a b c d e "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
- ^ a b c d e Pennsylvania Railroad. "D7 Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
- ^ 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.
- ^ Staufer, Alvin F. & Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900–1957. Staufer. LCCN 62020878.
- ^ Warner, Paul T. (1924). Motive Power Development on the Pennsylvania railroad System. Philadelphia: Baldwin.
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Pennsylvania Railroad locomotives
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