Firebox had combustion chamber and boiler had Elesco K-54 feedwater heater. When delivered, boilers were pressed at 205 psi.
First 25 H-7 (1540-1565) built by Alco in 1924, second 20 (1570-1589) built by Baldwin in 1926 (58922, 58950, 58964-58966 in January, 59052-59058 in March, 59110-59113 in April, 59174-59177 in May). The Baldwin H-7as were credited with slightly higher weight on drivers, larger heating surface (6,580 sq ft). Cylinder horsepower for all was 4,092 hp.
Alexander (American Locomotives, 1950) notes that H7 pulled 9,500-ton trains over 113-mile run from Russell, Kentucky to Columbus, Ohio in 5 hours. Averaged 4,400 miles per month until displaced by the 2-10-4s in Ohio and the 2-6-6-6 Alleghenies in the rest of the territory. 30 of the fifty were later leased to the Union Pacific. By then the fireboxes had been fitted with 167 sq ft of thermic syphon as shown in the specs.
| Specifications | |
|---|---|
| Class | H-7 |
| Locobase ID | 312 |
| Railroad | Chesapeake & Ohio (C & O) |
| Whyte | 2-8-8-2 |
| Road Numbers | 1540-1589 |
| Gauge | Std |
| Builder | Several |
| Year | 1924 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 15.75' |
| Engine Wheelbase | 58.08' |
| Ratio of driving wheelbase to overall engine wheebase | 0.27 |
| Overall Wheelbase (engine & tender) | 104.70' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 493070 lbs |
| Engine Weight | 567500 lbs |
| Tender Light Weight | 376340 lbs |
| Total Engine and Tender Weight | 943840 lbs |
| Tender Water Capacity | 21000 gals |
| Tender Fuel Capacity (oil/coal) | 25 tons |
| Minimum weight per yard of rail on which locomotive could run | 103 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 57" |
| Boiler Pressure | 215 psi |
| Cylinders (dia x stroke) | 23" x 32" (4) |
| Tractive Effort | 108547 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.54 |
| Heating Ability | |
| Firebox Area | 632 sq. ft |
| Grate Area | 112.20 sq. ft |
| Evaporative Heating Surface | 6580 |
| Superheating Surface | 1849 |
| Combined Heating Surface | 8429 |
| Evaporative Heating Surface/Cylinder Volume | 213.80 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 24123 |
| Same as above plus superheater percentage | 29430 |
| Same as above but substitute firebox area for grate area | 165774 |
| Power L1 | 17508 |
| Power MT | 626.26 |
| This page last modified: . | [Contact] | All material © 1999-2008 SteamLocomotive.com |
