Based on the K-1, the L&N ordered the K-2 in 1910, which was now operated with superheated steam. For this purpose, the number of tubes was more than halved in order to be able to accommodate flues with superheater elements. Rogers initially manufactured 20 of these locomotives, and 15 more were rebuilt from K-1.
Like most Pacifics in the USA, they initially hauled the main express trains, but after the introduction of more powerful locomotives they were increasingly pushed into service in front of regular passenger and commuter trains. The number 152, which was built as K-1, still exists today. It has been owned by the Kentucky Railroad Museum since 1957 and is currently being refurbished. 