| PRR D3 | |
| Powertype: | Steam |
| Builder: | PRR Altoona Works |
| Builddate: | 1869–1881 |
| Totalproduction: | 67 |
| Whytetype: | 4-4-0 |
| Uicclass: | 2′B |
| Leadingdiameter: | 280NaN0 (D2a)[1] |
| Driverdiameter: | 620NaN0 |
| Wheelbase: | 22feet |
| Length: | 54feet |
| Width: | 9feet |
| Height: | 14feet |
| Weightondrivers: | 509501NaN1 |
| Locoweight: | 791001NaN1 |
| Tenderweight: | 514001NaN1 |
| Locotenderweight: | 1305001NaN1 |
| Tendertype: | Eight-wheel with water scoop |
| Fueltype: | Soft coal |
| Fuelcap: | 80001NaN1 |
| Watercap: | 2400usgal |
The Pennsylvania Railroad's steam locomotive class D3 (formerly Class C, pre-1895) comprised sixty-seven 4-4-0 locomotives intended for general passenger and freight service, constructed at the railroad's own Altoona Works (now owned by Norfolk Southern) during 1869–1881.[2] They were the third standardized class of locomotives on the railroad and the most numerous of the early standard types; they shared many parts with other standard classes.[3]
This design differed from the Class A (later D1) mainly in its smaller drivers for greater tractive effort for freight haulage. Like all the early standardized 4-4-0s on the PRR, the Class C had a wagon-top boiler with steam dome and a firebox between the two driving axles.[4]
