Pennsylvania 0-4-0 Type Locomotives

Class Details by Steve Llanso

Class Q/A1 (Locobase 1154)

Light-duty switcher in warehouses. Built at both Altoona and Wilmington. Class data from Bob Berkey's The Broad Way website. (visited 16 Feb 2003).

Data from (Viewed September 2002)..

Class U/A3 (Locobase 1155)

Heavy-service switcher with Belpaire firebox. Class data from Bob Berkey's The Broad Way website. (visited 16 Feb 2003).

Specifications by Steve Llanso
Locobase ID1154 1155
RailroadPennsylvania (PRR)Pennsylvania (PRR)
Road Numbers
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase7'
Engine Wheelbase7'
Ratio of driving wheelbase to overall engine wheebase1
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)33400 lbs43500 lbs
Weight on Drivers63500 lbs80200 lbs
Engine Weight63500 lbs80200 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity750 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated) on which locomotive could run53 lb/yard67 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"50"
Boiler Pressure125 psi160 psi
Cylinders (dia x stroke)15" x 22"17" x 24"
Tractive Effort11953 lbs18866 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.31 4.25
Heating Ability
Firebox Area114 sq. ft
Grate Area12.25 sq. ft14.25 sq. ft
Evaporative Heating Surface594 sq. ft900 sq. ft
Superheating Surface
Combined Heating Surface594 sq. ft900 sq. ft
Evaporative Heating Surface/Cylinder Volume132.01142.74
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15312280
Same as above plus superheater percentage15312280
Same as above but substitute firebox area for grate area142500
Power L123710
Power MT164.630



Introduction and roster provided by Richard Duley. Class details and specifications provided by Steve Llanso of Sweat House Media.