The K28, K2, and K3 were the Pennsylvania's first examples of a 4-6-2 Pacific passenger steam locomotive. The first of this type ordered by the PRR was the lone K28, bought from the Pittsburgh Works of the American Locomotive Company (ALCo).

The PRR was looking for a new more powerful locomotive and bought its first "Pacific", an experimental 4-6-2 built in 1907, by the Pittsburgh Works of the American Locomotive Company. This single locomotive was designated as Class K-28 and given road number 7067.

The Pennsylvania Railroad Class K2 were a class of 72 Baldwin-built 4-6-2 "Pacific" type steam locomotive that were built by the Pennsylvania Railroad themselves at their own Juniata Shops in 1910. A total of 72 examples of the Pennsylvania Railroad Class …

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 - …

Two prototypes were built, #5698 at the PRR's own Altoona Works, and #5699 by the Baldwin Locomotive Works. Although classified identically, the two locomotives differed in many aspects, as detailed below.

A K4s decorated for PRR's "Lines West" to resemble other railroads' engines in the area. A pre-World War II K4s with "chicken-coop" pilot The K4s which was almost completely covered by her streamlining, thus earning the "torpedo" nickname from her crews.

Feb 2, 2003 · Pacifics rapidly became a favorite type on the PRR, and the K4s Pacific was especially favored, becoming one of the most famous classes of locomotive in the world. K2: 153 class K2 and 72 K2a were produced in 1910-13, all but two later being superheated. They were small and straight-boilered. Some existed until nearly the end.

best sources for K2/K2s/K2sa/K2sb photos. As far as the web goes, try www.northeast.railfan.net. Click on the PRR steam roster, then click on the K class listing. There are about two dozen K2 and subclass photos. I checked Rob Schoenberg's PRR page; the only Pacific he has listed on his steam diagrams page is the K4s.

Apr 8, 2025 · Espee P-4s are modernized rebuilds of much older Pacifics, and have little if anything in common with the PRR K4 design or its leading dimensions.

Just going from memory, the PRR did have early Pacific type locomotives, all of which would have be a "K Class", prior to the K4 series (maybe K2 and or K3?). At any rate the K4 Class were first named "K4", and when superheating was added, they were then classed K4s.