Class A was the 0-4-0 type, an arrangement best suited to small switcher locomotives (known as "shifters" in PRR parlance). Most railroads abandoned the 0-4-0 after the 1920s, but the PRR kept it for use on small industrial branches, especially those with street trackage and tight turns.

The A4s were a class of 0-4-0 switcher steam locomotives built by Altoona Works for the Pennsylvania Railroad from 1906 to 1913. They had a Belpaire firebox and 50" drivers.

The Pennsylvania Railroad 's class A5s was the most powerful class of 0-4-0 steam locomotives. The Pennsylvania Railroad built 47 in its Juniata Shops between 1916–1924. They were all retired by 1957. One is preserved at the Railroad Museum of Pennsylvania.

Feb 2, 2003 · Equipped with the PRR's trademark Belpaire firebox. Some converted to Class A3a tank locomotives, some surviving into the 1930s in this form. A4: 64 of these were built at Altoona, 1906-1913. The drivers were 50" and a Belpaire firebox was used. A5s: 47 of these were built at Altoona, 1916-1924.

PRR Locomotive and Car Drawings. This page includes instructions for obtaining Copies OF PRR (Pennsylvania Railroad Company) Mechanical Engineering Drawings for a Particular Locomotive or Piece of Rolling Stock. Determining Which Drawing Numbers You Want

On 28 April 1937, PRR's Board authorized $300,000 for this experimental high-speed passenger locomotive project. The design started with a 4-4-4-4 duplex. On 2 June 1937, PRR officially announced the development of the “Pennsylvania Type” high-speed passenger locomotive which would become Class S1.

The PRR classified articulated locomotives and joined locomotive units by using multiples of the previous classifications. Non-Articulated steam: 1320 - 2-2-2-0 locomotive, based on the London and North Western Railway's Dreadnought Class locomotive.

Class: Wheel Arr. Dr. Dia. Cylinders Diameter x Stroke: Boiler Press. Ad. Wt. EW WO: Grate Area: Evap. Surface: Sup. Surface: Remarks: A1: 0-4-0T: 44in: 15x22in ...

PRR Class A; Altoona Machine Shops, 1869-1891.

Oct 25, 2021 · The PRR had the J1s, a damn good engine, and chose to pursue the Q2 duplex, rather than buy more J1s. Conversely, the N&W borrowed a T1 to test and found it much ado about nothing. But if it had been to their liking, would N&W have been built a …