Pennsylvania 2-8-8-2 "Chesapeake" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class HH1s (Locobase 325)

Data from Wiener (1930).

A unique engine on the Pennsy, a simple-expansion articulated built at a time when all other articulateds were Mallet compounds. In a departure from Pennsylvania practice, this engine used a wagon-top boiler with the longest tubes of any engine in Locobase. A further departure was the builder--Alco didn't send many engines to the Pennsy. Note the low boiler pressure.

3396 operated in pusher service until 1928.

Specifications by Steve Llanso of Sweat House Media
Locobase ID325
RailroadPennsylvania (PRR)
Number in Class1
Road Numbers3396
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase41.83'
Engine Wheelbase57.41'
Ratio of driving wheelbase to overall engine wheebase 0.73
Overall Wheelbase (engine & tender)88.09'
Axle Loading (Maximum Weight per Axle)63000 lbs
Weight on Drivers437500 lbs
Engine Weight482500 lbs
Tender Light Weight186400 lbs
Total Engine and Tender Weight668900 lbs
Tender Water Capacity9000 gals
Tender Fuel Capacity (oil/coal)30 tons
Minimum weight of rail (calculated)91 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter56"
Boiler Pressure160 psi
Cylinders (dia x stroke)27" x 28"
Tractive Effort99144 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Firebox Area405.05 sq. ft
Grate Area96.55 sq. ft
Evaporative Heating Surface6125 sq. ft
Superheating Surface1257 sq. ft
Combined Heating Surface7382 sq. ft
Evaporative Heating Surface/Cylinder Volume165.05
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15448
Same as above plus superheater percentage18074
Same as above but substitute firebox area for grate area75825
Power L17832
Power MT315.73


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