Firebox had 76 sq ft of circulators. A relatively small 2-8-4 that was built in response to a rising demand for fast freight service out of the automobile plants in the Detroit area. The result, says Drury (1993), was a design that looked "condensed Nickel Plate Berkshires." They took their place as the elite class as they "were decades more modern than anything else on the property." Four arrived in December 1935 and two more in December 1939.
| Specifications | |
|---|---|
| Class | 700 |
| Locobase ID | 57 |
| Railroad | Detroit, Toledo & Ironton |
| Whyte | 2-8-4 |
| Road Numbers | 700-705 |
| Gauge | Std |
| Builder | Lima |
| Year | 1935 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.75' |
| Engine Wheelbase | 39.20' |
| Ratio of driving wheelbase to overall engine wheebase | 0.43 |
| Overall Wheelbase (engine & tender) | 86.15' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 248400 lbs |
| Engine Weight | 416000 lbs |
| Tender Light Weight | 361370 lbs |
| Total Engine and Tender Weight | 777370 lbs |
| Tender Water Capacity | 22000 gals |
| Tender Fuel Capacity (oil/coal) | 22 tons |
| Minimum weight per yard of rail on which locomotive could run | 103.50 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 250 psi |
| Cylinders (dia x stroke) | 25" x 30" |
| Tractive Effort | 63244 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.93 |
| Heating Ability | |
| Firebox Area | 394 sq. ft |
| Grate Area | 88.30 sq. ft |
| Evaporative Heating Surface | 4521 |
| Superheating Surface | 1795 |
| Combined Heating Surface | 6316 |
| Evaporative Heating Surface/Cylinder Volume | 265.25 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 22075 |
| Same as above plus superheater percentage | 28348.69 |
| Same as above but substitute firebox area for grate area | 126493.59 |
| Power L1 | 34877.34 |
| Power MT | 1238.19 |
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