Pittsburgh & West Virginia 2-6-6-4 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class J-1/J-2 (Locobase 301)

Data from 1930 Locomotive Cyclopedia, supplemented by P&WV 12-1937 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers ran 61788-61790 in 1934, 61950-61951 in 1936, and 62016-62017 in September 1937.

EW King, Jr. (in Drury, 1993) on the 2-6-6-4 design, of which these P&WVs were the first examples: "These locomotives were designed back to front. First consideration was given to providing a firebox-boiler combination capable of the required horsepower output -- a deep Belpaire firebox of liberal grate area located entirely behind the driving wheels." The low driver diameter didn't bother the P&WV because as a coal road, it didn't dabble in high speeds anyway.

J-1s had a tender-mounted booster engine that proved to be a maintenance headache; J-2s didn't have the booster. Firebox heating surface included 150 sq ft of the combustion chamber and 49 sq ft of "firebrick" tubes. Piston valves measured 12" in diameter.

Specifications by Steve Llanso of Sweat House Media
Locobase ID301
RailroadPittsburgh & West Virginia
Number in Class7
Road Numbers1100-1106
Number Built7
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase11'
Engine Wheelbase55.66'
Ratio of driving wheelbase to overall engine wheebase 0.20
Overall Wheelbase (engine & tender)98.33'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers397300 lbs
Engine Weight528040 lbs
Tender Light Weight377600 lbs
Total Engine and Tender Weight905640 lbs
Tender Water Capacity20000 gals
Tender Fuel Capacity (oil/coal)25 tons
Minimum weight of rail (calculated)110 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter64"
Boiler Pressure225 psi
Cylinders (dia x stroke)23" x 32"
Tractive Effort101171 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.93
Heating Ability
Firebox Area499 sq. ft
Grate Area102.30 sq. ft
Evaporative Heating Surface5914 sq. ft
Superheating Surface1873 sq. ft
Combined Heating Surface7787 sq. ft
Evaporative Heating Surface/Cylinder Volume192.16
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation23018
Same as above plus superheater percentage28542
Same as above but substitute firebox area for grate area139221
Power L119703
Power MT655.99

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