PRR D3
Encyclopedia
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 during 1869–1881.
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.
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.
Pennsylvania Railroad
The Pennsylvania Railroad was an American Class I railroad, founded in 1846. Commonly referred to as the "Pennsy", the PRR was headquartered in Philadelphia, Pennsylvania....
's steam locomotive
Steam locomotive
A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...
class D3 (formerly Class C, pre-1895) comprised sixty-seven 4-4-0
4-4-0
Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
locomotives intended for general passenger and freight service
Freight train
A freight train or goods train is a group of freight cars or goods wagons hauled by one or more locomotives on a railway, ultimately transporting cargo between two points as part of the logistics chain...
, constructed at the railroad's own Altoona Works during 1869–1881.
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.
This design differed from the Class A (later D1) mainly in its smaller drivers
Driving wheel
On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons...
for greater tractive effort
Tractive effort
As used in mechanical engineering, the term tractive force is the pulling or pushing force exerted by a vehicle on another vehicle or object. The term tractive effort is synonymous with tractive force, and is often used in railway engineering to describe the pulling or pushing capability of a...
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
Firebox
In a steam engine, the firebox is the area where the fuel is burned, producing heat to boil the water in the boiler. Most are somewhat box-shaped, hence the name.-Railway locomotive firebox :...
between the two driving axles.