Firebox had 80 sq ft of thermic syphons and 22 sq ft in 3 arch tubes, boiler had Elesco feedwater heater, valve gear had limited cutoff. The Cyclopedia table shows Walschaert, the diagram showed Baker Long Lap valve gear.
They were relatively light, small, and low-drivered. Nevertheless, these engines rattled windows and shook the ground, according to a December 1993 Trains recollection. And they weren't kind to the rails.
| Specifications | |
|---|---|
| Class | T-3a |
| Locobase ID | 94 |
| Railroad | Central Vermont (CNR) |
| Whyte | 2-10-4 |
| Road Numbers | 700-709 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1928 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase | 22' |
| Engine Wheelbase | 44.20' |
| Ratio of driving wheelbase to overall engine wheebase | 0.50 |
| Overall Wheelbase (engine & tender) | 82.18' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 285000 lbs |
| Engine Weight | 419000 lbs |
| Tender Light Weight | 269600 lbs |
| Total Engine and Tender Weight | 688600 lbs |
| Tender Water Capacity | 13500 gals |
| Tender Fuel Capacity (oil/coal) | 20 tons |
| Minimum weight per yard of rail on which locomotive could run | 95 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 60" |
| Boiler Pressure | 250 psi |
| Cylinders (dia x stroke) | 27" x 32" |
| Tractive Effort | 82620 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.45 |
| Heating Ability | |
| Firebox Area | 423 sq. ft |
| Grate Area | 84.40 sq. ft |
| Evaporative Heating Surface | 4703 |
| Superheating Surface | 2208 |
| Combined Heating Surface | 6911 |
| Evaporative Heating Surface/Cylinder Volume | 221.78 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 21100 |
| Same as above plus superheater percentage | 27430 |
| Same as above but substitute firebox area for grate area | 137475 |
| Power L1 | 31466 |
| Power MT | 1217.03 |
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