Western Maryland 4-4-0 "American" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class D-8 (Locobase 10788)

Data from Baldwin Locomotive Works, Record of Recent Construction ((1903), No. 39, p.268-269 Works numbers were 20755-20756 in August 1902.

This pair of Americans was suited to the WM's mountainous profiles and served the line for 30 years before being scrapped in 1935 (52) and 1936 (51).

Specifications by Steve Llanso of Sweat House Media
ClassD-8
Locobase ID10,788
RailroadWestern Maryland (WM)
CountryUSA
Whyte4-4-0
Number in Class2
Road Numbers93-94 / 51-52
GaugeStd
Number Built2
BuilderBurnham, Williams & Co
Year1902
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.50 / 2.29
Engine Wheelbase (ft / m)21.58 / 6.58
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender) (ft / m)45.75 / 13.94
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)67,165 / 30,466
Engine Weight (lbs / kg)104,785 / 47,530
Tender Loaded Weight (lbs / kg)65,215 / 29,581
Total Engine and Tender Weight (lbs / kg)170,000 / 77,111
Tender Water Capacity (gals / ML)3300 / 12.50
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)56 / 28
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62 / 1575
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)19,189 / 8703.99
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.50
Heating Ability
Firebox Area (sq ft / m2)125 / 11.62
Grate Area (sq ft / m2)29.24 / 2.72
Evaporative Heating Surface (sq ft / m2)1606 / 149.26
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1606 / 149.26
Evaporative Heating Surface/Cylinder Volume227.20
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5263
Same as above plus superheater percentage5263
Same as above but substitute firebox area for grate area22,500
Power L15871
Power MT385.42

Reference