Cumbres and Toltec Scenic Railroad (Denver and Rio Grande Western) 463 is a 3-foot narrow-gauge class "K-27" 2-8-2 "Mikado" type steam locomotive built for the Denver and Rio Grande Railroad (D&RG) by the Baldwin Locomotive Works in 1903.

Fifteen locomotives were built, originally class 125, then reclassified K-27 in 1924 when the D&RG became the Denver and Rio Grande Western Railroad (D&RGW).

The extra maintenance costs of the two cylinders were greater than the fuel saving, so they were converted to simple expansion in 1907–1909.

They pulled freight, passenger and mixed trains on the D&RGW in and over the Colorado Rocky Mountains, traversing the entire length of the railroad.

In 2009, it was moved to the railroad's shop at Chama, New Mexico where a major rebuild was taken until completion in Spring 2013.