The

Pennsylvania Railroad The Pennsylvania Railroad (reporting mark PRR), legal name The Pennsylvania Railroad Company also known as the "Pennsy", was an American Class I railroad that was established in 1846 and headquartered in Philadelphia, Pennsylvania. It was named ...

's class H8, H9s and H10s

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomot ...

s were of the

2-8-0 Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, eight powered and coupled driving wheels on four axles, and no trailing wheels. ...

"Consolidation" type, the last three classes of such built by the railroad. The three classes differed only in

cylinder A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infin ...

diameter and thus

tractive effort As used in mechanical engineering, the term tractive force can either refer to the total traction a vehicle exerts on a surface, or the amount of the total traction that is parallel to the direction of motion. In railway engineering, the term tr ...

, each subsequent class increasing that measurement by an inch. The first H8 was built in 1907 and the last H10 in 1916; within a few years they were replaced on heavy freight assignments by 2-8-2s and 2-10-0. They became the railroad's standard light freight locomotive, replacing all other class H 2-8-0s, and a number remained in service until the end of PRR steam locomotive operation in 1957. 968 class H8 of various subclasses were constructed, along with 274 class H9s and 273 class H10s. A number of H8 locomotives were rebuilt to H9s specification. Class H10s was built primarily for PRR Lines West, and featured a typical Lines West tender with sloping side coal boards at the top, to enable a bigger load of coal to be carried. Some locomotives of this type were leased to the PRR-owned

Long Island Rail Road The Long Island Rail Road , often abbreviated as the LIRR, is a commuter rail system in the southeastern part of the U.S. state of New York (state), New York, stretching from Manhattan to the eastern tip of Suffolk County, New York, Suffolk Co ...

, becoming the primary freight-hauling type on that system.

Survivors

7688, an H10s built in 1915 by the Lima Locomotive Works, has been preserved by the

Railroad Museum of Pennsylvania The Railroad Museum of Pennsylvania is a railroad museum in Strasburg, Lancaster County, Pennsylvania. The museum is located on the east side of Strasburg along Pennsylvania Route 741. It is administered by the Pennsylvania Historical and Museu ...

. It joins two earlier examples of the H class at the museum. #7688 was added to the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic v ...

in 1979 as Consolidation Freight Locomotive No. 7688.

References

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Survivors

References

Further reading