They varied in size, with the large K-37 being a modified standard gauge steam locomotives built on a narrow gauge frame.
About 75% of the Baldwin-built locomotives are preserved.
They were built from the 1860's to the 1950's, and were discontinued due to the End of the Steam Era and the D&RGW's full transition to standard gauge in the 1960's.
List of locomotive types from year, date, build, and company:
Baldwin Locomotive Works:
K-27 (2-8-2) 1900's
K-28 (2-8-2) 1920's
K-36 (2-8-2) 1920's
K-37 (2-8-2) 1930's (Rebuilt from standard gauge Class C-41 locomotives)
Several small tank engines and tender engines were also built by Lima and other numerous companies, but came and went and weren't primarily used during the narrow-gauge era of the D&RGW.
The US Army purchased several D&RGW K-27's and renamed, renumbered, and repainted them into the Class 250 or '250 Class USA'. All were scrapped.
NdeM of Mexico was inspired by the D&RGW to rebuild their standard gauge steam locomotives with a narrow-gauge frames.