The Pennsylvania Railroad K4 was a class of 425 4-6-2 steam locomotives built between 1914 and 1928 for the Pennsylvania Railroad (PRR), where they served as the primary mainline passenger steam locomotives on the entire PRR system until late 1957.

The Pennsylvania Railroad designed, built, and operated a fleet of 425 4-6-2 'Pacific' type steam locomotives classified in the "K" series. Some locomotives were modified with an added superheater, after which they were given a lowercase "s" …

Builder's photograph of Altoona-built K5, #5698. Water cap. Factor of adh. The Pennsylvania Railroad 's class K5 were experimental 4-6-2 "Pacific" types, built in 1929 to see if a larger Pacific than the standard K4s was worthwhile. Two prototypes were built, #5698 at the PRR's own Altoona Works, and #5699 by the Baldwin Locomotive Works.

2025年1月17日 · The firebox and boiler of PRR Class K4s 4-6-2 engine No. 1361 under restoration at Altoona, Pa., with the tender in the foreground. Fund-raising has tipped past the halfway point for the $2.4 million project.

There are two surviving PRR "Pacific", both are Class K-4s, number 1361 being restored at Steamtown National Historical Site in Scranton, PA and number 3750 which is on display at the Railroad Museum of Pennsylvania in Strasburg, PA.

For more than thirty- five years the engine hauled trains of the iconic PRR passenger fleet over the main line, first between New York and Pittsburgh and later, after the eastern lines. When the locomotive was finally retired in 1956, K4s 1361 had rolled up 2,469,000 miles—the mileage equivalent of ten round-trips to the moon.

The PRR assigned class K to the 4-6-2 "Pacific" type. The Pacific was the most common type of passenger locomotive on the Pennsylvania. K2 - 153 built at Altoona 1910-1911; K3s - 30 built by Baldwin in 1913. K4 - 425 built by the PRR and Baldwin 1914-1928. K5 - …

2024年8月25日 · 1361 quickly became a vital component of the PRR’s fleet, hauling passenger trains across the vast network of lines, primarily in the Northeastern United States. Known for their reliability and speed, the K4s-class engines were instrumental in defining the PRR's reputation for superior passenger service.

Pennsylvania Railroad Photographic Roster, Locomotive Model: 4-6-2. Unit # Notes Model Serial # Pictures : PRR 1360 : 4-6-2 1

Pennsylvania Railroad K-4 Project Versions 'AS BUILT & EARLY' (1927-32) 'PRE-WAR' (1938-40) 'POST-WAR' (1946-52) 'MIXED CONFIGURATION' (1946-52) 'K-4SA' (1952 & Later ...