Pittsburgh & West Virginia 2-6-6-4 Locomotives in 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 Rail Data Exchange. 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 side-rod booster engine that proved to be a maintenance headache (an extra 30" between the first and second axles of the rear truck bore witness to the booster even after it was removed). J-2s didn't have the booster. Firebox heating surface included 150 sq ft (13.94 sq m) from the combustion chamber and 49 sq ft (4.55 sq m) of "firebrick" tubes. Piston valves measured 12" (305 mm) in diameter.

Principal Dimensions 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 / m)11 / 3.35
Engine Wheelbase (ft / m)55.66 / 16.97
Ratio of driving wheelbase to overall engine wheebase 0.20
Overall Wheelbase (engine & tender) (ft / m)98.33 / 29.97
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)397,300 / 180,212
Engine Weight (lbs / kg)528,040 / 239,515
Tender Loaded Weight (lbs / kg)377,600 / 171,277
Total Engine and Tender Weight (lbs / kg)905,640 / 410,792
Tender Water Capacity (gals / ML)20,000 / 75.76
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)25 / 22.70
Minimum weight of rail (calculated) (lb/yd / kg/m)110 / 55
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)64 / 1600
Boiler Pressure (psi / kPa)225 / 15.50
High Pressure Cylinders (dia x stroke) (in / mm)23" x 32" / 584x813 (4)
Tractive Effort (lbs / kg)101,171 / 45890.45
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.93
Heating Ability
Firebox Area (sq ft / m2)499 / 46.38
Grate Area (sq ft / m2)102.30 / 9.51
Evaporative Heating Surface (sq ft / m2)5914 / 549.63
Superheating Surface (sq ft / m2)1873 / 174.07
Combined Heating Surface (sq ft / m2)7787 / 723.70
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

All material Copyright © SteamLocomotive.com
Wes Barris