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. Works numbers were 68781-68786 in March 1937.
Don Ball called these the shyest Northerns he'd ever heard of. Certainly they were among the lightest of that wheel arrangement. They were obviously intended for freight work.
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.
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
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | H-10 |
Locobase ID | 283 |
Railroad | Toledo, Peoria, & Western |
Country | USA |
Whyte | 4-8-4 |
Number in Class | 6 |
Road Numbers | 80-85 |
Gauge | Std |
Number Built | 6 |
Builder | Alco-Schenectady |
Year | 1937 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 18.25 / 5.56 |
Engine Wheelbase (ft / m) | 44.25 / 13.49 |
Ratio of driving wheelbase to overall engine wheelbase | 0.41 |
Overall Wheelbase (engine & tender) (ft / m) | 89.42 / 27.26 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 51,000 / 23,133 |
Weight on Drivers (lbs / kg) | 204,000 / 92,533 |
Engine Weight (lbs / kg) | 361,000 / 163,747 |
Tender Loaded Weight (lbs / kg) | 324,000 / 146,964 |
Total Engine and Tender Weight (lbs / kg) | 685,000 / 310,711 |
Tender Water Capacity (gals / ML) | 18,000 / 68.18 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 18 / 16 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 85 / 42.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 69 / 1753 |
Boiler Pressure (psi / kPa) | 250 / 1720 |
High Pressure Cylinders (dia x stroke) (in / mm) | 23.5" x 30" / 597x762 |
Tractive Effort (lbs / kg) | 51,023 / 23143.67 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.00 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 190 - 2.25" / 57 |
Flues (number - dia) (in / mm) | 45 - 5.5" / 140 |
Flue/Tube length (ft / m) | 19.91 / 6.07 |
Firebox Area (sq ft / m2) | 443 / 41.17 |
Grate Area (sq ft / m2) | 77.30 / 7.18 |
Evaporative Heating Surface (sq ft / m2) | 3961 / 368.12 |
Superheating Surface (sq ft / m2) | 1096 / 101.86 |
Combined Heating Surface (sq ft / m2) | 5057 / 469.98 |
Evaporative Heating Surface/Cylinder Volume | 263.01 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 19,325 |
Same as above plus superheater percentage | 23,577 |
Same as above but substitute firebox area for grate area | 135,115 |
Power L1 | 30,621 |
Power MT | 1323.68 |