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 class |
2′B |
|---|
| Gauge |
4 ft 8 1⁄2 in (1,435 mm) |
|---|
| Leading dia |
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] |
|---|
| 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] |
|---|
| Loco & tender 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:
• Firegrate area |
34.75 sq ft (3.23 m2)[3] |
|---|
| Boiler pressure |
140 lbf/in2 (970 kPa)[3] |
|---|
| Heating surface |
1,289 sq ft (119.75 m2)[3] |
|---|
| • Tubes |
1,134 sq ft (105.35 m2)[3] |
|---|
| • Firebox |
155 sq ft (14.40 m2)[3] |
|---|
| Cylinders |
2[3] |
|---|
| Cylinder size |
17 in × 24 in (432 mm × 610 mm)[3] |
|---|
| Valve gear |
Stephenson |
|---|
| Valve type |
Slide valves |
|---|
|
|
|
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 2 3 4 5 "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
- 1 2 3 4 5 Pennsylvania Railroad. "D7 Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 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.
