Western Maryland 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 21 (Locobase 11794)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 11, p. 27. Works numbers were 6257, 6260 in June 1882; 6330 in August.

All three of these Moguls served for 25 years on the WM before being sold in April 1907 to Southern Iron & Equipment, the locomotive rebuilder/reseller that renumbered the trio 590-592. Each was then sold to a different lumber company beginning with 591 to Titusville Lumber in July 1907, then 592 to Henderson Lumber Company in August, and ending with 590 to Alexandria Lumber (Alexandria, La) in March 1908.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID11794
RailroadWestern Maryland (WM)
Number in Class3
Road Numbers21-23
Number Built3
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.50 / 4.42
Engine Wheelbase (ft / m)22.08 / 6.73
Ratio of driving wheelbase to overall engine wheelbase 0.66
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)66,000 / 29,937
Engine Weight (lbs / kg)78,000 / 35,380
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)2400 / 9.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)37 / 18.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)17,185 / 7794.99
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.84
Heating Ability
Tubes (number - dia) (in / mm)184 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.73 / 3.27
Firebox Area (sq ft / m2)103 / 9.57
Grate Area (sq ft / m2)16 / 1.49
Evaporative Heating Surface (sq ft / m2)1135 / 105.48
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1135 / 105.48
Evaporative Heating Surface/Cylinder Volume160.54
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2080
Same as above plus superheater percentage2080
Same as above but substitute firebox area for grate area13,390
Power L12528
Power MT253.33

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