Central Branch of the Union Pacific 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 1000 (Locobase 10045)

Data from MP 1924 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 12, p. 105. Works numbers were 7681-7682, 7687, 7698-7699 in October 1885.

This Mogul quintet was built at the same time as the Missouri Pacific locomotives shown in Locobase 7718. The Central Branch was built to take advantage of generous land grants secured through Congress in the late 1860s in central Kansas. In 1909, the CB was absorbed by the Missouri Pacific. The five engines all entered class M-51 and took the last five 3600 numbers in this large group.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID10,045
RailroadCentral Branch of the Union Pacific
Number in Class7
Road Numbers1000-1004/3685-3689
Number Built7
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.59 / 3.84
Engine Wheelbase (ft / m)20.04 / 6.11
Ratio of driving wheelbase to overall engine wheebase 0.63
Overall Wheelbase (engine & tender) (ft / m)45.98 / 14.01
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)86,400 / 39,190
Engine Weight (lbs / kg)
Tender Loaded Weight (lbs / kg)83,066 / 37,678
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)9 / 8.20
Minimum weight of rail (calculated) (lb/yd / kg/m)48 / 24
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)19" x 22" / 483x559
Tractive Effort (lbs / kg)18,531 / 8405.53
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.66
Heating Ability
Firebox Area (sq ft / m2)110 / 10.22
Grate Area (sq ft / m2)22.60 / 2.10
Evaporative Heating Surface (sq ft / m2)1181 / 109.72
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1181 / 109.72
Evaporative Heating Surface/Cylinder Volume163.59
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3164
Same as above plus superheater percentage3164
Same as above but substitute firebox area for grate area15,400
Power L12853
Power MT218.40

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