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. 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).

Both locomotives performed well enough to be kept in service, but not enough to persuade the PRR to build more. They proved that building a larger Pacific than the K4s was not worthwhile, as the reduced factor of adhesion limited the locomotives' ability to put their greater power to full use.

Notes for classes K2, K2s, K2a and K2sa: all had 24" x 26" cylinders, 80" drivers, fabricated trailing trucks, Belpaire fireboxes with 55.4 square feet of grate area, piston valves and Walschaerts valve gear. K2b: 2 blt Altoona in 1911. Similar to class K2 but had 72" drivers and cast Kiesel trailing trucks. K2sb

A PRR K2 class being axle tested shortly after completion in the Juniata Shops. Photo used with permission.

******************** In 1914 the Pennsylvania Railroad built, what many people believe to be, one of the most famous Locomotives to have ever roamed the rails, the K4s Class 4-6-2 Pacific. It was so successful that the Pennsy had 424 more built.

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.

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