At the same time Baldwin delivered the quartet of Ten-wheelers down in Locobase 12248 to the RGW, the company also produced this foursome of powerful Moguls. They were among the few US classes in this wheel arrangement to use the larger-diameter 2 1/4" tubes in boilers that ranked among the top in the ratio of heating surface area to cylinder volume.
Early narrow-gauge Moguls in Colorado. Fitted with Westinghouse air brakes in 1872. All of the class had names: Show-wa-no 3, Tabi-Wachi 2, Ouray 5, Arkansas 8, Huerfano 9, San Carlos 10, Cuchuras 11, and Las Animas 12. The Las Animas had a larger tender that carried 1,000 gallons (3,785 litres) of water.
Ran until 1883.
Second class of narrow-gauge Moguls with cylinders just 1 inch bigger in Colorado. First with eight-wheel, two-truck tenders. Their names were Santa Clara, Chicosa, Raton. Ran until 1889, when the first was dismantled.
A fourth engine built to the same specs first operated on the Centennial Narrow Gauge as the Delaware during the 1876 Philadelphia Exposition (Locobase 9680). The fair ended in 1877 and she was sold to the D&RG as their 19 and named Monte Christo
Works numbers were
October 11292-11293, 11296-11297, 11300, 11302, 11312
December 11446-11447, 11450, 11463, 11485, 11487, 11494-11495
February 11579, 11623-11624
May 11881, 11886
The mountainous profile of the D & RG dictated the small drivers on these Moguls. The class clambered up and down the lines hauling local freight for 25 years and more. 805-807 were renumbered 827-829 in 1908.
Most were scrapped in the mid-19teens, but 821 was rebuilt as a 2-6-0T tank engine in 1917 and the 578 (renumbered from 828 in 1928) was similarly made over in 1928. 814 and 823 were sold to the Denver & Intermountain Railway in July 1917 and 809 was sold in August 1917 to Elk Creek Coal Company.
819, 821-822, 826 were renumbered in 1924 to 579, 575, 577, 576 respectively.
|Specifications by Steve Llanso of Sweat House Media|
|Class||203||35||40||805 / G-20|
|Railroad||Rio Grande Western (D & RGW)||Denver & Rio Grande (D&RGW)||Denver & Rio Grande (D&RGW)||Denver & Rio Grande (D&RGW)|
|Number in Class||4||8||4||22|
|Road Numbers||200-203||2-3, 5, 8-12||13-15, 19||805-826|
|Builder||Burnham, Williams & Co||M. Baird & Co||Burnham, Parry, Williams & Co||Burnham, Parry, Williams & Co|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||14.17||11.67||12.50|
|Engine Wheelbase (ft)||22.50||177||19.75|
|Ratio of driving wheelbase to overall engine wheebase||0.63||0.07||0.63|
|Overall Wheelbase (engine & tender) (ft)||52.30|
|Axle Loading (Maximum Weight per Axle) (lbs)|
|Weight on Drivers (lbs)||85,000|
|Engine Weight (lbs)||140,600||35,000||40,000||100,000|
|Tender Loaded Weight (lbs)||84,000|
|Total Engine and Tender Weight (lbs)||224,600|
|Tender Water Capacity (gals)||5000||750||1200||3000|
|Tender Fuel Capacity (oil/coal) (gals/tons)|
|Minimum weight of rail (calculated) (lb/yd)||47|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||61||36||36||46|
|Boiler Pressure (psi)||200||130||130||140|
|High Pressure Cylinders (dia x stroke) (in)||20" x 26"||11" x 16"||12" x 16"||18" x 24"|
|Tractive Effort (lbs)||28,984||5942||7072||20,116|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.23|
|Firebox Area (sq ft)||145||60||125.65|
|Grate Area (sq ft)||28.50||7.90||8.40||20.40|
|Evaporative Heating Surface (sq ft)||2064||451||1629|
|Superheating Surface (sq ft)|
|Combined Heating Surface (sq ft)||2064||451||1629|
|Evaporative Heating Surface/Cylinder Volume||218.32||215.34||230.46|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||5700||1027||1092||2856|
|Same as above plus superheater percentage||5700||1027||1092||2856|
|Same as above but substitute firebox area for grate area||29,000||7800||17,591|