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 Wheelbase (ft)11
Engine Wheelbase (ft)55.66
Ratio of driving wheelbase to overall engine wheebase 0.20
Overall Wheelbase (engine & tender) (ft)98.33
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)397,300
Engine Weight (lbs)528,040
Tender Loaded Weight (lbs)377,600
Total Engine and Tender Weight (lbs)905,640
Tender Water Capacity (gals)20,000
Tender Fuel Capacity (oil/coal) (gals/tons)25
Minimum weight of rail (calculated) (lb/yd)110
Geometry Relating to Tractive Effort
Driver Diameter (in)64
Boiler Pressure (psi)225
High Pressure Cylinders (dia x stroke) (in)23" x 32" (4)
Tractive Effort (lbs)101,171
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.93
Heating Ability
Firebox Area (sq ft)499
Grate Area (sq ft)102.30
Evaporative Heating Surface (sq ft)5914
Superheating Surface (sq ft)1873
Combined Heating Surface (sq ft)7787
Evaporative Heating Surface/Cylinder Volume192.16
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation23,018
Same as above plus superheater percentage28,542
Same as above but substitute firebox area for grate area139,221
Power L119,703
Power MT655.99

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