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The Denver and Rio Grande Western K-37 is a class of 2-8-2 "Mikado" type narrow-gauge steam locomotives built for the Denver and Rio Grande Western Railroad. They were new steam locomotives built in the D&RGW Burnham Shops as a near copy of the Rio Grande class K-36.[3] In-house production was chosen to preemptively address material shortages and personnel issues (any possible labor unrest could be more easily controlled by the D&RGW).[3] Burnham Shops was assisted in the construction of the class by the Stearn-Rogers Manufacturing Company.[4] The class recycled components from Baldwin Locomotive Works-built Class 19 (later C-41) 2-8-0 locomotives used on the Rio Grande's standard gauge; re-using the boiler, tender and other components salvaged from the C-41's.[3] The engine components (particularly the frame, valve gear, wheels, and counterweights) were constructed new for the locomotive class.[5]

Design
The locomotives are of outside-frame design, with the driving wheels placed b