Philadelphia & Reading 0-12-0 Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class Pennsylvania (Locobase 5959)

Data from Gustav Reder (1974), pl. 177; and "Twelve-Coupled Locomotive, Philadelphia and Reading", Engineering, Volume 3 (28 June 1867), p 667.

Built as a helper by James Milholland to handle trains up the Falls Grade which traversed the ridge between the Schuykill and Delaware Rivers near Philadelphia. A great hulking beast with a camelback-style cab perched on the boiler, this first-of-a-kind twelve-coupled had no tender and no bunkerage. The huge, wide firebox was stoked at the beginning of the slog up the grade and that sufficed.

The lightly built freight cars of the time couldn't handle the high drawbar pull and the locomotive was converted to a more orthodox banker in 1870.

Specifications by Steve Llanso of Sweat House Media
ClassPennsylvania
Locobase ID5959
RailroadPhiladelphia & Reading
CountryUSA
Whyte0-12-0T
Number in Class1
Road Numbers
GaugeStd
Number Built1
BuilderReading
Year1863
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)19.58 / 5.97
Engine Wheelbase (ft / m)19.58 / 5.97
Ratio of driving wheelbase to overall engine wheebase1
Overall Wheelbase (engine & tender) (ft / m)19.58 / 5.97
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)110,250 / 50,009
Engine Weight (lbs / kg)110,250 / 50,009
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)110,250
Tender Water Capacity (gals / ML)12,000 / 45.45
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)31 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43 / 1092
Boiler Pressure (psi / kPa)100 / 6.90
High Pressure Cylinders (dia x stroke) (in / mm)20" x 26" / 508x660
Tractive Effort (lbs / kg)20,558 / 9324.96
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.36
Heating Ability
Firebox Area (sq ft / m2)198
Grate Area (sq ft / m2)31.50 / 2.93
Evaporative Heating Surface (sq ft / m2)1428 / 132.66
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1428 / 132.66
Evaporative Heating Surface/Cylinder Volume151.05
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3150
Same as above plus superheater percentage3150
Same as above but substitute firebox area for grate area19,800
Power L11833
Power MT219.92

Reference