Although famous for its stable of 425 K4 class 4-6-2s, the Pennsylvania Railroad also experimented with two Pacifics of the K5 design. No. 5698 came from the PRR's own shops in Altoona in 1929 with 80-inch drivers, 27x30 cylinders, and a boiler pressure of 250 p.s.i. She weighed 327,560 pounds and developed 54,675 pounds of tractive force. The grate area was 70 square feet, the evaporative heating surface 4285 square feet, and the superheating surface 1634 square feet. The other K5, No. 5699, was built at the same time by Baldwin Locomotive Works and equipped with the Caprotti poppet valve gear, which was later replaced by the Walschaerts gear. Oddly enough, these K5s — supposedly an improvement over the K4 — were hand-fired. Evidently the railroad concluded that the K5s were no improvement over the ubiquitous K4s, and the design was not repeated. Some of their features, however, were incorporated into the highly successful M1 4-8-2s. This image of No. 5698 was snapped in Pittsburgh on August 27, 1935 by an unidentified lensman; it comes to our Random Steam Collection from Carl Weber.