Pennsylvania 0-4-0 "Switcher" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

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. http://broadway.pennsyrr.com/Rail/Prr/Rosters/steam_class.html#class_j (visited 16 Feb 2003).

Data from http://prr.railfan.net/diagrams/PRRdiagrams.html?diag=a1_oldq.gif&sel=ste&sz=sm&fr= (Viewed September 2002)..


Class U/A3 (Locobase 1155)

Heavy-service switcher with Belpaire firebox. Class data from Bob Berkey's The Broad Way website. http://broadway.pennsyrr.com/Rail/Prr/Rosters/steam_class.html#class_j (visited 16 Feb 2003).

Specifications by Steve Llanso of Sweat House Media
ClassQ/A1U/A3
Locobase ID1154 1155
RailroadPennsylvania (PRR)Pennsylvania (PRR)
CountryUSAUSA
Whyte0-4-00-4-0
Number in Class881
Road Numbers
GaugeStdStd
Number Built881
BuilderAltoona
Year18851893
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.137 / 2.13
Engine Wheelbase (ft / m)7 / 2.137 / 2.13
Ratio of driving wheelbase to overall engine wheebase11
Overall Wheelbase (engine & tender) (ft / m)37.08 / 11.30
Axle Loading (Maximum Weight per Axle) (lbs / kg)33,400 / 15,15043,500 / 19,731
Weight on Drivers (lbs / kg)63,500 / 28,80380,200 / 36,378
Engine Weight (lbs / kg)63,500 / 28,80380,200 / 36,378
Tender Loaded Weight (lbs / kg)41,150 / 18,665
Total Engine and Tender Weight (lbs / kg)121,350 / 55,043
Tender Water Capacity (gals / ML)750 / 2.842700 / 10.23
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) 3.85 / 3.50
Minimum weight of rail (calculated) (lb/yd)5367
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 111850 / 1270
Boiler Pressure (psi / kPa)125 / 8.60160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)15" x 22" / 381x55917" x 24" / 432x610
Tractive Effort (lbs / kg)11,953 / 5421.8018,866 / 8557.48
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.31 4.25
Heating Ability
Firebox Area (sq ft / m2)114 / 10.5990.10 / 8.37
Grate Area (sq ft / m2)12.25 / 1.1414.25 / 1.32
Evaporative Heating Surface (sq ft / m2)594 / 55.20900 / 83.61
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)594 / 55.20900 / 83.61
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 area14,25014,416
Power L123712856
Power MT164.63157.02

Reference