Drury (1993) says these engines "rode poorly above 40 mph, sometimes so roughly that the reverse gear wheel would suddenly spin into full forward gear. When that happened the throttle had to be closed at once and the valve gear returned to the proper position -- and several engineers broke an arm doing so." (203) The trailing truck also had a tendency to derail when backing up.
Modifications reduced cylinder size by an inch to 27" and raised BP to 265 psi in 1939, increasing tractive effort to 78,200 lb. One of the class -- 7038 -- was rebuilt in 1936 as a 4-6-4; see Locobase 1357.
| Specifications | |
|---|---|
| Class | 7000 |
| Locobase ID | 48 |
| Railroad | Illinois Central (IC) |
| Whyte | 2-8-4 |
| Road Numbers | 7000-7049 |
| Gauge | Std |
| Builder | Lima |
| Year | 1926 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.50' |
| Engine Wheelbase | 41.70' |
| Ratio of driving wheelbase to overall engine wheebase | 0.40 |
| Overall Wheelbase (engine & tender) | 82.48' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 248000 lbs |
| Engine Weight | 388000 lbs |
| Tender Light Weight | |
| Total Engine and Tender Weight | 0 |
| Tender Water Capacity | 15000 gals |
| Tender Fuel Capacity (oil/coal) | 20 tons |
| Minimum weight per yard of rail on which locomotive could run | 103.33 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 240 psi |
| Cylinders (dia x stroke) | 28" x 30" |
| Tractive Effort | 76160 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.26 |
| Heating Ability | |
| Firebox Area | 414 sq. ft |
| Grate Area | 100 sq. ft |
| Evaporative Heating Surface | 5164 |
| Superheating Surface | 2111 |
| Combined Heating Surface | 7275 |
| Evaporative Heating Surface/Cylinder Volume | 241.53 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 24000 |
| Same as above plus superheater percentage | 30964.12 |
| Same as above but substitute firebox area for grate area | 128191.47 |
| Power L1 | 30919.68 |
| Power MT | 1099.45 |
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