The K-27 is a class of 3 ft narrow gauge 2-8-2 "Mikado" type steam locomotives built for the Denver and Rio Grande Railroad by the Baldwin Locomotive Works in 1903. Known by their nickname "Mudhens," they were the first and the most numerous of the four K classes of Rio Grande narrow gauge engines to be built. Of the original fleet of 15 locomotives, two survive to this day and operate on heritage railways. No. 463 is operational on the Cumbres and Toltec Scenic Railroad (C&TSRR), and No. 464 is currently out of service due to a rebuild on the Huckleberry Railroad.