One diagram notes that those H5s fitted with thermic syphons add 50 sq ft to the firebox heating surface. That is the version shown in the specs, which also show 12 fewer boiler tubes as a result. Engine 119 was fitted with a superheater that contributed 570 sq ft to the total heating surface of 2 ,905 sq ft. To house the 30 5 3/8" superheater flues, the boiler lost 167 2" tubes. See H5SA (Locobase 7063) for the as-built superheated version of this class.
Twelve of these superheated Consolidations came from the Pittsburgh Locomotive Works (builder's numbers 55834-55839 and 58658-58663); Porter supplied the 13th (its number 6848).
| Specifications | ||
|---|---|---|
| Class | H5 | H5SA |
| Locobase ID | 7062 | 7063 |
| Railroad | Monongahela | Monongahela |
| Whyte | 2-8-0 | 2-8-0 |
| Road Numbers | 115-140 | 141-153 |
| Gauge | Std | Std |
| Builder | Alco-Pittsburgh | Alco-Pittsburgh |
| Year | 1909 | 1916 |
| Valve Gear | Baker | Baker |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 14.25' | 14.25' |
| Engine Wheelbase | 23.17' | 23.50' |
| Ratio of driving wheelbase to overall engine wheebase | 0.62 | 0.61 |
| Overall Wheelbase (engine & tender) | 63.67' | 58.25' |
| Axle Loading (Maximum Weight per Axle) | 45600 lbs | 47050 lbs |
| Weight on Drivers | 170300 lbs | 178340 lbs |
| Engine Weight | 193600 lbs | 201390 lbs |
| Tender Light Weight | 138000 lbs | 150000 lbs |
| Total Engine and Tender Weight | 331600 lbs | 351390 lbs |
| Tender Water Capacity | 7000 gals | 8500 gals |
| Tender Fuel Capacity (oil/coal) | 14 tons | 17 tons |
| Minimum weight per yard of rail on which locomotive could run | 70.96 lb rail | 74.31 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 51" | 51" |
| Boiler Pressure | 200 psi | 200 psi |
| Cylinders (dia x stroke) | 21" x 30" | 22.5" x 30" |
| Tractive Effort | 44100 lbs | 50625 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.86 | 3.52 |
| Heating Ability | ||
| Firebox Area | 239 sq. ft | 166 sq. ft |
| Grate Area | 51.70 sq. ft | 51.70 sq. ft |
| Evaporative Heating Surface | 3029 | 2335 |
| Superheating Surface | 570 | |
| Combined Heating Surface | 3029 | 2905 |
| Evaporative Heating Surface/Cylinder Volume | 251.86 | 169.13 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 10340 | 10340 |
| Same as above plus superheater percentage | 10340 | 12368.85 |
| Same as above but substitute firebox area for grate area | 47800 | 39714.29 |
| Power L1 | 5970.86 | 10214.17 |
| Power MT | 309.18 | 505.07 |
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