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The Denver & 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. 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). Burnham Shops was assisted in the construction of the class by the Stearn-Rogers Manufacturing Company. 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. The engine components (particularly the frame, valve gear, wheels, and counterweights) were constructed new for the locomotive class.

The locomotives are of outside-frame design, with the driving wheels placed between the two chassis frames which support the boiler, but with the cylinders, driving rods, counterweights and valve gear on the outside. This general arrangement is shared with the earlier K-27, K-28 and K-36 Mikado type engines.

Steam locomotives are a popular and attractive element of heritage railroads like the D&SNG and the C&TSRR. Burning coal tends to produce cinders, which can be a primary source of ignition for wildfires. Converting an engine from coal to oil eliminates the source of cinders. This will allow the engines to run when drought conditions would warrant replacing a steam engine with a diesel locomotive to decrease the probability of ignition.

On May 4, 2016, the D&SNG, in cooperation with the Colorado Railroad Museum, transported locomotive #493 to Durango after resting in Silverton for almost 20 years with the plan of having the museum transport it to Golden, Colorado and have it restored as well. However, after plans with the museum fell through, the D&SNG decided to undertake the restoration of #493 themselves. In the restoration process of #493 however, the locomotive was converted to oil-burning, making it the very first former D&RGW 2-8-2 to be converted to oil-burning instead of coal-burning, the next one being K-28 class #473.[7] On January 24, 2020, #493 moved under its own power for the first time in over 50 years, making it the first D&RGW K-37 class since #497 to run on the D&SNG. #493 then ran its first revenue run on the D&SNG on February 14, 2020.

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The White Pass and Yukon Route Class DL-535E (sometimes known as the MLW-Worthington Model Series C-14) is a series of narrow-gauge diesel locomotives that were custom-built by the Montreal Locomotive Works of Montreal, Quebec in Canada between 1969 and 1971 for the White Pass and Yukon Route (WP&Y) in Skagway, Alaska.

Units 101-107 were built in May 1969 while units 108-110 were built in December 1971. They are powered by an American Locomotive Company (ALCO) model 6-251D prime mover. In July 1982, the White Pass and Yukon Route (WP&Y) ordered an additional four units, those being units 111-114, built by the Bombardier Transportation, complete with a wide cab instead of the traditional standard cab at the time, but these units were ultimately never delivered to them and eventually placed in storage.

In 1992, Units #102 and #105 were both severely damaged and burned beyond repair in a roundhouse fire in Skagway, Alaska and later scrapped as a result. Later that year, Nos. 101, 103, 104, 106, and 107 were sold to Sociedad Colombiana de Transport Ferroviaro in South America until later being sold back to the White Pass and Yukon Route in 1999 for tourist excursion service.

In April 2020, Nos. 101, 103, 106, and 107 were sold again to the Durango and Silverton Narrow Gauge Railroad (D&SNG) in Durango, Colorado, with Nos. 101 and 107 both arriving at the D&SNG in August and September of that year respectively and Nos. 103 and 106 both arriving at the D&SNG in September 2021. This was due to the late delivery of D&SNG MP2000NG type diesels Nos. 1201 and 1202, which were both custom-built by the now-defunct Motive Power and Equipment Solutions, Inc. (MP&ES) of Greenville, South Carolina sometime between 2018 and 2020, having both been rebuilt from two former Tri-Rail EMD F40PHL-2 type diesels.

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