PRR D2
PRR D2 & D2a|
Class B A #138 (later class D2a) |
| Type and origin |
|---|
| Power type |
Steam |
|---|
| Builder |
PRR Altoona Works |
|---|
| Build date |
1868–1872 (D2);
1881–1882 (D2a) |
|---|
| Total produced |
20 (D2); 45 (D2a) |
|---|
|
| Specifications |
|---|
| Configuration |
4-4-0 |
|---|
| UIC class |
2′B |
|---|
| Gauge |
4 ft 8 1⁄2 in (1,435 mm) |
|---|
| Leading dia |
28 in (711 mm) (D2)[1]
30 in (762 mm) (D2a)[2] |
|---|
| Driver diameter |
62 in (1,575 mm) (D2)[1]
68 in (1,727 mm) (D2a)[2] |
|---|
| Wheelbase |
22 ft 5 5⁄8 in (6.85 m)[2][3] |
|---|
| Length |
54 ft 5.44 in (16.60 m)[2][3] |
|---|
| Width |
9 ft 0.94 in (2.77 m)[2][3] |
|---|
| Height |
14 ft 8 in (4.47 m) (D2)[3]
14 ft 11 in (4.55 m) (D2a)[2] |
|---|
| Adhesive weight |
52,500 lb (23.8 tonnes) (D2)[3]
53,750 lb (24.4 tonnes) (D2a)[2] |
|---|
| Loco weight |
80,500 lb (36.5 tonnes) (D2)[3]
82,200 lb (37.3 tonnes) (D2a)[2] |
|---|
| Tender weight |
51,400 lb (23.3 tonnes) (D2 & D2a)[2][3] |
|---|
| Loco & tender weight |
131,900 lb (59.8 tonnes) (D2)[3]
133,600 lb (60.6 tonnes)[2] |
|---|
| Tender type |
Eight-wheel with water scoop |
|---|
| Fuel type |
Soft coal |
|---|
| Fuel capacity |
8,000 lb (3.6 tonnes)[3] |
|---|
| Water cap |
2,400 US gal (9,100 l; 2,000 imp gal)[3] |
|---|
|
The Pennsylvania Railroad's steam locomotive class D2 (formerly Class B, pre-1895) comprised twenty 4-4-0 locomotives intended for mountain passenger helper service, constructed at the railroad's own Altoona Works during 1869–1880. [4]
They were the second standardized class of locomotives on the railroad and shared many parts with other standard classes.[1]
This design differed from the Class A (later D1) mainly in its smaller drivers for greater tractive effort in mountainous terrain. Like all the early standardized 4-4-0s on the PRR, the Class B had a wagon-top boiler with steam dome and a firebox between the two driving axles.
In 1881, the PRR took the Class B design and modified it to produce more locomotives for express passenger service, with 68-inch (1,727 mm) drivers like the earlier Class A. These new locomotives were designated Class B A, and were classified as B2a in the post-1895 scheme; forty-five of them were constructed.[4][5]
References
- 1 2 3 Dredge, James (1879). The Pennsylvania Railroad. London: Engineering magazine.
- 1 2 3 4 5 6 7 8 9 10 Pennsylvania Railroad. "Class D2 diagram". PRR.Railfan.net. Retrieved 2008-08-19.
- 1 2 3 4 5 6 7 8 9 10 Pennsylvania Railroad. "Class D2a diagram". PRR.Railfan.net. Retrieved 2008-08-19.
- 1 2 "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
- ↑ Warner, Paul T. (1924). Motive Power Development on the Pennsylvania Railroad System. Philadelphia: Baldwin Locomotive Works.
