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 inherited twelve "Pacific" locomotives when the railroad absorbed the Vandalia Line, in 1917. These ALCO built 4-6-2 locomotives weighed 263,000 pounds and had 80" drivers, 24 x 26 cylinders, a 200 psi boiler pressure and they exerted 31,824 lbs of tractive effort.

The Pennsylvania Railroad Class K3 was a class of 30 Baldwin-built 4-6-2 "Pacific" type steam locomotive that were built by Baldwin Locomotive Works in 1913 for the Pennsylvania Railroad as part of their K Series.

The Pacific was the most common type of passenger locomotive on the Pennsylvania. K3s - 30 built by Baldwin in 1913. K4 - 425 built by the PRR and Baldwin 1914-1928. Class L was assigned to the 2-8-2 "Mikado" type. L2s - the USRA standard light Mikado (5 built for PRR). L5 - PRR 2nd generation DC electric locomotive.

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.

K3, K4 – 4-6-2 – The work horse of the PRR passenger locomotive fleet was the 425 K4 Pacific class locomotives. They were used on all PRR routes out of Columbus.

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.

This page includes instructions for obtaining Copies OF PRR (Pennsylvania Railroad Company) Mechanical Engineering Drawings for a Particular Locomotive or Piece of Rolling Stock.

Pennsylvania Railroad Photographic Roster Reporting Marks: PRR Showing Locomotive model 4-6-2 Click on a locomotive to view pictures

Jul 31, 2010 · some special expressions in cases of GG1s and PRR in alphabet order: Why is she called the GG1? The Pennsylvania Railroad had a standard system for identifying locomotives by wheel arrangement. For example a 4-6-2 was a K, a 2-10-0 was an I, a 2-8-2 was a L. subsequent models would get a number such as K2, K3, K4.