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

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. (Thanks to Chris Hohl for his 10 November 2017 email noting the changes made in the Pennsylvania after her initial service.) Reading works number was 52 in September 1863.

Originally designed in 1857 by James Milholland, this engine was finally produced six years later a helper 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 by removing one of the six axles. Hohl also notes that the cab design had changed and she now trailed a tender.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID5959
RailroadPhiladelphia & Reading
Number in Class1
Road Numbers
Number Built1
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

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