The Pennsylvania Railroad K4s was a class of 425 4-6-2 steam locomotives built between 1914 and 1928 for the Pennsylvania Railroad, where they served as the primary mainline passenger steam locomotive
PRR No. 3863 being inspected and maintained in the 1930s
A drawing design of the PRR K4s class locomotive
Baldwin builder's photo of Pennsylvania Railroad K4s 5400
No. 3768 in Raymond Loewy casing.
Under the Whyte notation for the classification of steam locomotives, 4-6-2 represents the wheel arrangement of four leading wheels on two axles, six powered and coupled driving wheels on three axles
Pennsylvania Railroad class K4
…The Pennsylvania Railroad K4s 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…
New Zealand's Q class, the first true Pacific locomotive
Builder's photograph of Altoona-built K5 no. 5698, 1929
Cape Government Railways Enlarged Karoo Class, SAR Class 5
The LNER Peppercorn Class A1 60163 Tornado, built in 2008