Utah & Northern 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 6 (Locobase 15963)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 9, pp. 5, 61. (Thanks to Devon Sinsley for his 21 February 2015 email containing information on U&N 14, which Works numbers were 4425, 4429-4430 in September 1878; 4555, 4558-4559, 4561-4564 in March 1879; 4964, 4966, 4967 in February 1880; 5121-5122 in May, and 5129 in June.

Although all of these narrow-gauge soft-coal Moguls were produced to identical specs, the 1880 locomotives changed the proportions of fuel and water in the tenders, opting for 100 US gallons (378.5 litres) more water. All had the 12" diameter diamond stack so characteristic of Western US engines.

The U&N, itself a successor road, became part of the Oregon Short Line & Utah Northern

in August 1889. Citing Don Strack's excellent Utah Rails website (Strack, Don. "Utah & Northern Railway (1878-1889: Locomotives." Utahrails.net. Retrieved on September 28, 2014 from http://utahrails.net/utahrails/utah-and-northern-ry-1878-1889-locos.php.)), Sinsley reports that the 18 (ex-14) was sold in 1887 to the Coeur D'Alene Railway & Navigation Company as their 3. Several other sources do not show this transaction, but Strack's seems to be derived from the most direct link to the U&N.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,963
RailroadUtah & Northern
Number in Class16
Road Numbers6-21/10-25
Number Built16
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.67 / 3.56
Engine Wheelbase (ft / m)17.67 / 5.39
Ratio of driving wheelbase to overall engine wheebase 0.66
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)33,000 / 14,969
Engine Weight (lbs / kg)40,000 / 18,144
Tender Loaded Weight (lbs / kg)36,000 / 16,329
Total Engine and Tender Weight (lbs / kg)76,000 / 34,473
Tender Water Capacity (gals / ML)1200 / 4.55
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)18 / 9
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)7160 / 3247.73
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.61
Heating Ability
Firebox Area (sq ft / m2)53 / 4.92
Grate Area (sq ft / m2) 8.20 / 0.76
Evaporative Heating Surface (sq ft / m2)450 / 41.81
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)450 / 41.81
Evaporative Heating Surface/Cylinder Volume190.99
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1066
Same as above plus superheater percentage1066
Same as above but substitute firebox area for grate area6890
Power L12630
Power MT527.10

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