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.
http://gelwood.railfan.net/other/dh/dh-stm-bk-html published locomotive diagrams that showed the superheat at 840 sq ft, an increase over the original size.
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.
Data from 1933 D & H Description of Locomotives books supplied in May 2005 by Allen Stanley from his extensive collection.
| Specifications | ||
|---|---|---|
| Class | P | P-1 |
| Locobase ID | 3076 | 143 |
| Railroad | Delaware & Hudson | Delaware & Hudson |
| Whyte | 4-6-2 | 4-6-2 |
| Road Numbers | 600-609 | 651-653 |
| Gauge | Std | Std |
| Builder | Alco-Schenectady | D & H |
| Year | 1914 | 1929 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 13' | 13.50' |
| Engine Wheelbase | 34.83' | 35.30' |
| 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 per yard of rail on which locomotive could run | 106.11 lb rail | 106.11 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 69" | 73" |
| 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 |
| Heating Ability | ||
| Firebox Area | 317 sq. ft | 320 sq. ft |
| Grate Area | 99.32 sq. ft | 86.94 sq. ft |
| Evaporative Heating Surface | 3896 | 3208 |
| Superheating Surface | 840 | 1495 |
| Combined Heating Surface | 4736 | 4703 |
| Evaporative Heating Surface/Cylinder Volume | 265.74 | 260.41 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 20360.60 | 22604.40 |
| Same as above plus superheater percentage | 23971.86 | 29789.94 |
| Same as above but substitute firebox area for grate area | 76511.06 | 109647.80 |
| Power L1 | 20970.36 | 46896.19 |
| Power MT | 726.15 | 1623.90 |
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