Data from VGN 8 - 1951 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error.) 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 (13.1 bar). 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" (356 mm) piston valves.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | PA |
| Locobase ID | 174 |
| Railroad | Virginian (VGN) |
| Country | USA |
| Whyte | 4-6-2 |
| Number in Class | 6 |
| Road Numbers | 210-215 |
| Gauge | Std |
| Number Built | 6 |
| Builder | Alco-Richmond |
| Year | 1920 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.17 / 3.71 |
| Engine Wheelbase (ft / m) | 34.75 / 10.59 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.35 |
| Overall Wheelbase (engine & tender) (ft / m) | 70.60 / 21.52 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 63,800 / 28,939 |
| Weight on Drivers (lbs / kg) | 189,000 / 85,729 |
| Engine Weight (lbs / kg) | 298,000 / 135,171 |
| Tender Loaded Weight (lbs / kg) | 188,100 / 85,321 |
| Total Engine and Tender Weight (lbs / kg) | 486,100 / 220,492 |
| Tender Water Capacity (gals / ML) | 10,500 / 39.77 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 14 / 13 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 105 / 52.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 69 / 1753 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 26" x 28" / 660x711 |
| Tractive Effort (lbs / kg) | 46,634 / 21152.85 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.05 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 190 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 40 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 18.50 / 5.64 |
| Firebox Area (sq ft / m2) | 293 / 27.23 |
| Grate Area (sq ft / m2) | 66.70 / 6.20 |
| Evaporative Heating Surface (sq ft / m2) | 3414 / 317.29 |
| Superheating Surface (sq ft / m2) | 905 / 84.11 |
| Combined Heating Surface (sq ft / m2) | 4319 / 401.40 |
| Evaporative Heating Surface/Cylinder Volume | 198.37 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 13,340 |
| Same as above plus superheater percentage | 16,141 |
| Same as above but substitute firebox area for grate area | 70,906 |
| Power L1 | 17,406 |
| Power MT | 609.11 |
