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Denver & Rio Grande Western class K-27
originally class 125
United States | 1903 | 15 produced
No. 463 in July 2016 on the Cumbres and Toltec Scenic Railroad
No. 463 in July 2016 on the Cumbres and Toltec Scenic Railroad
Chris Light

The K-27 class was the last compound locomotive built for D&RGW. The “K” stood for “Mikado” and the number for starting tractive effort of 27,000 pounds. Its engine had four cylinders and was of the Vauclain type, but was replaced by a simple two-cylinder engine just four years after delivery. As with other narrow-gauge locomotives of the D&RGW, the axles were in an outer frame. The nickname “Mudhen” came about because with the original engine they often derailed. Most K-27s were scrapped in the fifties and the last two built still exist today. The No. 463 runs on the Cumbres & Toltec Scenic Railroad and the No. 464 is owned by the Huckleberry Railroad and last ran in 2019.

Variantas builtrebuilt simplesuperheated
Axle config2-8-2 (Mikado) 
Gauge3 ft 0 in (Three feet)
Dimensions and Weights
Wheelbase24 ft 6 in
Fixed wheelbase11 ft 5 in
Total wheelbase51 ft 0 1/2 in
Service weight125,500 lbs136,850 lbs140,250 lbs
Adhesive weight100,000 lbs104,255 lbs108,300 lbs
Total weight197,500 lbs220,150 lbs223,550 lbs
Axle load26,300 lbs27,475 lbs27,969 lbs
Water capacity3,500 us gal4,100 us gal
Fuel capacity17,000 lbs (coal)
Power sourcesteam
Estimated power900 hp (671 kW)1,100 hp (820 kW)
Optimal speed24 mph21 mph26 mph
Starting effort23,424 lbf27,022 lbf
with start valve28,109 lbf
Power Plant
Driver diameter40 in
Boiler pressure200 psi
Expansion typecompoundsimple
Cylindersfour, HP: 13 x 22 in
and LP: 22 x 22 in
two, 17 x 22 in
Grate area30.2 sq ft
Firebox area106 sq ft113 sq ft
Tube heating area2,027 sq ft1,413 sq ft
Evaporative heating area2,133 sq ft1,526 sq ft
Superheater area407 sq ft
Total heating area2,133 sq ft1,933 sq ft
Calculated Values
steam locomotive
narrow gauge
Vauclain compound
last changed: 08/2023

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