These were far better proportioned engines than the Triplexes built for the Erie or the 2-8-8-8-4 that later entered service on the Virginian. Their boiler and grate demand factors were within reason, which meant the crew could keep steam up. The LP cylinders measured 48 in (1,219 mm) in diameter and contained a volume of 33.51 ft (949 liters) each. Simple starting TE reached 176,000 lb.
Hollingsworth (North American Locomotives London: Salamander Books, 1984) says they had piston valves on the HP cylinders, slide valves on the LP where pressures and temperatures were lower.
Estimating Engineer James Partington of Alco, in a paper delivered in December 1921 ("Avoidable Waste in Locomotive Operation as Affected by Design", Railway Age, Volume 95, No. 11 (5 November 1921), pp. 673-677) said that a double decapod pulled a 15,725-ton train from Princeton, Va. to Roanoke burning 26.9 lb of coal per 1,000 ton-miles. Another 2-10-10-2 managed 17,250 tons (110 cars) over a ruling adverse grade of 0.2%. It is Partington's data that appears in the specifications.
They performed well for 30 years, first as pushers for the 2.11% grade at Elmore until replaced by electric engines, later as helpers on other grades. EW King, Jr (in Drury, 1993) notes that except for the addition of Worthington BL feedwater heaters, these engines were never modified.
|Specifications by Steve Llanso of Sweat House Media|
|Number in Class||10|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.31|
|Overall Wheelbase (engine & tender)||97'|
|Axle Loading (Maximum Weight per Axle)||61712 lbs|
|Weight on Drivers||617000 lbs|
|Engine Weight||684000 lbs|
|Tender Light Weight||231000 lbs|
|Total Engine and Tender Weight||915000 lbs|
|Tender Water Capacity||13000 gals|
|Tender Fuel Capacity (oil/coal)||20 tons|
|Minimum weight of rail (calculated)||103 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||215 psi|
|High Pressure Cylinders (dia x stroke)||30" x 32"|
|Low Pressure Cylinders (dia x stroke)||48" x 32" (2)|
|Tractive Effort||135170 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.56|
|Firebox Area||516 sq. ft|
|Grate Area||108.80 sq. ft|
|Evaporative Heating Surface||8605 sq. ft|
|Superheating Surface||2120 sq. ft|
|Combined Heating Surface||10725 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||328.69|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||23392|
|Same as above plus superheater percentage||28070|
|Same as above but substitute firebox area for grate area||133128|