In February 2006, Locobase put out a call for more information on this design on the Classic Trains forum and received diagrams from Ray Breyer, a Peoria-based modeller who had obtained several pages of TP & W diagrams. From the diagram and the accompanying roster, Locobase was able to complete the record.
This design was remarkably small for a 4-8-4. Even the TP & W's own H-8/H-9 Consolidations (Locobase 7445) put more weight on the drivers. On the other hand, the firebox heating surface and superheat area were proportionally quite generous. Included in the direct heating surface were 15 sq ft of arch tubes and 89 sq ft of thermic syphons.
This class of six locomotives was produced in a batch by Alco in March 1937; works numbers were 68781-68786. At the other end of their TP & W careers, all six H-10s are shown as going to Keystone in 1950 in the following order:
83 2/25
82 5/25
81 7/25
85 9/5
86 9/12
80 10/11
| Specifications | |
|---|---|
| Class | H-10 |
| Locobase ID | 283 |
| Railroad | Toledo, Peoria, & Western |
| Whyte | 4-8-4 |
| Road Numbers | 8080-8085 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1937 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 18.25' |
| Engine Wheelbase | 44.25' |
| Ratio of driving wheelbase to overall engine wheebase | 0.41 |
| Overall Wheelbase (engine & tender) | 89.25' |
| Axle Loading (Maximum Weight per Axle) | 51000 lbs |
| Weight on Drivers | 204000 lbs |
| Engine Weight | 361000 lbs |
| Tender Light Weight | 324000 lbs |
| Total Engine and Tender Weight | 685000 lbs |
| Tender Water Capacity | 18000 gals |
| Tender Fuel Capacity (oil/coal) | 18 tons |
| Minimum weight per yard of rail on which locomotive could run | 85 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 69" |
| Boiler Pressure | 250 psi |
| Cylinders (dia x stroke) | 23.5" x 30" |
| Tractive Effort | 51023 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.00 |
| Heating Ability | |
| Firebox Area | 443 sq. ft |
| Grate Area | 77.30 sq. ft |
| Evaporative Heating Surface | 2865 |
| Superheating Surface | 1096 |
| Combined Heating Surface | 3961 |
| Evaporative Heating Surface/Cylinder Volume | 190.24 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 19325 |
| Same as above plus superheater percentage | 24672.19 |
| Same as above but substitute firebox area for grate area | 141394.28 |
| Power L1 | 28528.02 |
| Power MT | 1233.20 |
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