These were the only 20th-Century Eight-wheelers operated by the VGN. As Chris Hohl pointed out, they were delivered to the Tidewater Railway as 11-16 with 61" drivers. Locobase wonders at that figure, which is clearly entered in the Baldwin specs, because the driver centers are shown as 56" (1,422 mm). The 5" (127 mm) difference seems too low because the usual tire thickness at that time was 3 to 3 1/2" (76 to 89 mm). If the locomotives were delivered with 3 1/2" tires, their nominal diameter would be 63". Locobase uses that latter figure for reasons given immediately below.
The class was renovated in the 1920s, the results visible in the increased area of the firebox to 184.5 sq ft (17.5 sq m) thanks to two arch tubes contributing 12.5 sq ft ( sq m) and a concomitant rise in the total heating surface area to 2,026 sq ft (188.29 sq m). Prince's Virginian roster shows that 295-296 and 298-299 rolled on 67" drivers. Weight on their drivers increased to 107,500 lb (48,761 kg) and engine weight rose to 150,500 lb (68,039 kg); maximum axle loading was 60,000 lb (27,216 kg). Tractive effort with the new wheels dropped to 21,400 lb (9,707 kg).
294 and 297 retained their 63" wheels and now had adhesion weights of 105,000 lb/47,627 kg (max axle loading of 58,750 lb/26,649 kg) and engine weights reaching 148,000 lb (67,132 kg). Empty, the tender weighed (25,492 kg); loaded with 10,500 US gallons (39,770 litres) of water and 14 tons of coal, its weight came to 134,500 lb (61,008 kg).
All but one was disposed of in the 1930s, two in 1934, three in 1937. For some reason 295 lasted into the 1950s; by that time, she had regained her 63" drivers.
|Specifications by Steve Llanso of Sweat House Media|
|Number in Class||6|
|Builder||Burnham, Williams & Co|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.35|
|Overall Wheelbase (engine & tender)||56.96'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||94000 lbs|
|Engine Weight||135000 lbs|
|Tender Light Weight||140000 lbs|
|Total Engine and Tender Weight||275000 lbs|
|Tender Water Capacity||7000 gals|
|Tender Fuel Capacity (oil/coal)||14 tons|
|Minimum weight of rail (calculated)||78 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||200 psi|
|Cylinders (dia x stroke)||18" x 26"|
|Tractive Effort||22731 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.14|
|Firebox Area||184.50 sq. ft|
|Grate Area||29.70 sq. ft|
|Evaporative Heating Surface||2026 sq. ft|
|Combined Heating Surface||2026 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||264.57|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||5940|
|Same as above plus superheater percentage||5940|
|Same as above but substitute firebox area for grate area||36900|