PRR D7
| PRR D7 | |
|---|---|
|
PRR D7a #953 in its builders' portrait | |
| Type and origin | |
| Power type | Steam |
| Builder | PRR Altoona Works[1] |
| Build date | 1882–1891[1] |
| Total produced | 58 D7, 61 D7a[1] |
| Specifications | |
| Configuration | 4-4-0 |
| UIC classification | 2′B |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading wheel diameter |
30 in (762 mm) (D7)[2] 33 in (838 mm) (D7a)[3] |
| Driver diameter |
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] |
| Weight on drivers |
56,700 lb (25.7 tonnes) (D7) [2] 58,700 lb (26.6 tonnes)[3] |
| Locomotive weight |
93,500 lb (42.4 tonnes) (D7)[2] 96,330 lb (43.7 tonnes) (D7a)[3] |
| Locomotive and tender combined weight | 160,880 lb (73.0 tonnes)[3] |
| Fuel type | Anthracite coal[1] |
| Fuel capacity | 12,000 lb (5.4 tonnes)[3] |
| Water capacity | 2,400 US gal (9,100 l; 2,000 imp gal)[3] |
| Boiler pressure | 140 lbf/in2 (970 kPa)[3] |
| Firegrate area | 34.75 sq ft (3.23 m2)[3] |
| Heating surface: – Tubes | 1,134 sq ft (105.35 m2)[3] |
| – Firebox | 155 sq ft (14.40 m2)[3] |
| – Total | 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 |
| Performance figures | |
| Tractive effort |
12,138 lbf (53.99 kN) (D7) 13,313 lbf (59.22 kN) (D6a) |
| Factor of adhesion | 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 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
- ↑ 1.0 1.1 1.2 1.3 1.4 "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
- ↑ 2.0 2.1 2.2 2.3 2.4 Pennsylvania Railroad. "D7 Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 Pennsylvania Railroad. "D7a Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
- ↑ Staufer, Alvin F. and 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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