Firebox heating surface includes 40 sq ft (3.7 sq m) of arch tubes.
Because these engines used the big anthracite-burning grate, one can draw a misleading conclusion about this design's ability to steam, particularly in reviewing the A/S ratio of tube/flue cross-section to grate area. Coincidentally, the Railway Age article (14 December 1914) describing these engines makes the point a different way: "According to the method of boiler proportioning used [by Alco], these ...engines have 111 percent boilers." RA explains that 100 percent means ample steam-making capacity, but passenger engines should have some in reserve.
Given the D&H's limited passenger demands these engines were quite worthy and ran until 1952-1953.
Although laid out according to orthodox American design, these three engines had a British look in their clean boilers, thick and wide face shield below the smokebox, and plain smokebox face with headlight centered. Two had poppet valves and one piston valves -- all were experimental and did not lead to large classes.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Delaware & Hudson||Delaware & Hudson|
|Number in Class||10||3|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.37||0.38|
|Overall Wheelbase (engine & tender)||70.35'||86.56'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||191000 lbs||191000 lbs|
|Engine Weight||293500 lbs||300000 lbs|
|Tender Light Weight||135000 lbs||160500 lbs|
|Total Engine and Tender Weight||428500 lbs||460500 lbs|
|Tender Water Capacity||8000 gals||11000 gals|
|Tender Fuel Capacity (oil/coal)||14 tons||14 tons|
|Minimum weight of rail (calculated)||106 lb/yard||106 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||205 psi||260 psi|
|Cylinders (dia x stroke)||24" x 28"||22" x 28"|
|Tractive Effort||40729 lbs||41027 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.69||4.66|
|Firebox Area||317 sq. ft||320 sq. ft|
|Grate Area||99.32 sq. ft||86.94 sq. ft|
|Evaporative Heating Surface||3896 sq. ft||3208 sq. ft|
|Superheating Surface||840 sq. ft||1495 sq. ft|
|Combined Heating Surface||4736 sq. ft||4703 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||265.74||260.41|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||20361||22604|
|Same as above plus superheater percentage||24026||29838|
|Same as above but substitute firebox area for grate area||76682||109824|