One of the most interesting parts of the diagram that details this 15-locomotive batch is the table of calculations that shows the share of total water evaporation contributed by each of the major heating components. The fire tubes were assessed 9.78 lb/sq ft/hour and the flues 11.59 lb/sq ft/hour; together the two sizes of boiler tubes turned 23,615 lb of water per hour into steam. The firebox's basic 161 sq ft operated at 55 lb/sq ft/hour -- 8,855 lb -- and its 60 sq ft of thermic syphons - calculated to have the same efficiency as the firebox sides and top, added 3,300 lb.
By the time the diagram was prepared, 3 of the remaining 8 locomotives had Baker gear, the other five operating Walschaert gear.
Librairie polytechnique, Baudry et Cie, p404-406
Drury (1993) comments that while "impressive looking" they weighed only a little more than the earlier Moguls and were too slow for main-line service. Demoulin attributed the design to the New Haven's Chief Enginneer M Henney. He credited them with 1,000 tons capacity over steep grades and tight curves.
| Specifications | ||
|---|---|---|
| Class | F-5 | P-1 |
| Locobase ID | 8112 | 3154 |
| Railroad | New Haven | New Haven |
| Whyte | 2-8-0 | 2-8-0 |
| Road Numbers | 150-164 | 278 |
| Gauge | Std | Std |
| Builder | Alco-Schenectady | Rhode Island |
| Year | 1929 | 1894 |
| Valve Gear | Baker or Walschaert | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 17.25' | 15' |
| Engine Wheelbase | 26.17' | 23.08' |
| Ratio of driving wheelbase to overall engine wheebase | 0.66 | 0.65 |
| Overall Wheelbase (engine & tender) | 58.15' | 52.06' |
| Axle Loading (Maximum Weight per Axle) | 47700 lbs | |
| Weight on Drivers | 184000 lbs | 141000 lbs |
| Engine Weight | 213000 lbs | 156850 lbs |
| Tender Light Weight | 147400 lbs | |
| Total Engine and Tender Weight | 360400 lbs | 0 |
| Tender Water Capacity | 8000 gals | |
| Tender Fuel Capacity (oil/coal) | 12 tons | tons |
| Minimum weight per yard of rail on which locomotive could run | 76.67 lb rail | 58.75 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 63" | 51" |
| Boiler Pressure | 180 psi | 180 psi |
| Cylinders (dia x stroke) | 24" x 32" | 21" x 26" |
| Tractive Effort | 44763 lbs | 34398 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.11 | 4.10 |
| Heating Ability | ||
| Firebox Area | 221 sq. ft | 182.34 sq. ft |
| Grate Area | 53 sq. ft | 33.47 sq. ft |
| Evaporative Heating Surface | 2523 | 2113 |
| Superheating Surface | 496 | |
| Combined Heating Surface | 3019 | 2113 |
| Evaporative Heating Surface/Cylinder Volume | 150.58 | 202.73 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 9540 | 6024.60 |
| Same as above plus superheater percentage | 11107.35 | 6024.60 |
| Same as above but substitute firebox area for grate area | 46315.57 | 32821.20 |
| Power L1 | 9127.86 | 4440.03 |
| Power MT | 437.47 | 277.69 |
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