Virginian 4-6-2 "Pacific" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class PA (Locobase 174)

Data from VGN 8 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 61992-61996 in September 1920, 61997 in October.

Note the low drivers on this mountain-climbing Pacific. Like the TA Ten-wheelers, these were built by Richmond in a single batch

Boilers originally pressed at 190 psi. Fitted with Duplex stokers. EW King, Jr (in Drury, 1993) says another distinguishing feature was "their two cross-compound air pumps under the left running board." Another was the relatively generous 14" piston valves.

Specifications by Steve Llanso of Sweat House Media
Locobase ID174
RailroadVirginian (VGN)
Number in Class6
Road Numbers210-215
Number Built6
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase (ft)12.17
Engine Wheelbase (ft)34.75
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender) (ft)70.60
Axle Loading (Maximum Weight per Axle) (lbs)63,800
Weight on Drivers (lbs)189,000
Engine Weight (lbs)298,000
Tender Loaded Weight (lbs)188,100
Total Engine and Tender Weight (lbs)486,100
Tender Water Capacity (gals)10,500
Tender Fuel Capacity (oil/coal) (gals/tons)14
Minimum weight of rail (calculated) (lb/yd)105
Geometry Relating to Tractive Effort
Driver Diameter (in)69
Boiler Pressure (psi)200
High Pressure Cylinders (dia x stroke) (in)26" x 28"
Tractive Effort (lbs)46,634
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.05
Heating Ability
Firebox Area (sq ft)293
Grate Area (sq ft)66.70
Evaporative Heating Surface (sq ft)3414
Superheating Surface (sq ft)905
Combined Heating Surface (sq ft)4319
Evaporative Heating Surface/Cylinder Volume198.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13,340
Same as above plus superheater percentage16,141
Same as above but substitute firebox area for grate area70,906
Power L117,410
Power MT609.24

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