The first standard-gauge Mallet built in the United States, this helper engine was jointly designed by the B&O's James E Muhlfield and Alco's Carl J. Mellin. Old Maud, so called after a comic-strip mule, proved an immediate success on the B&O's western Pennsylvania grades. Her scrapping came only in 1938.
| Specifications | |
|---|---|
| Class | DD1 |
| Locobase ID | 2794 |
| Railroad | Baltimore & Ohio (B&O) |
| Whyte | 0-6-6-0 |
| Road Numbers | 2400 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1904 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 10' |
| Engine Wheelbase | 30.67' |
| Ratio of driving wheelbase to overall engine wheebase | 0.33 |
| Overall Wheelbase (engine & tender) | 64.58' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 334565 lbs |
| Engine Weight | 334565 lbs |
| Tender Light Weight | 206400 lbs |
| Total Engine and Tender Weight | 540965 lbs |
| Tender Water Capacity | 7000 gals |
| Tender Fuel Capacity (oil/coal) | 15 tons |
| Minimum weight per yard of rail on which locomotive could run | 92.93 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 56" |
| Boiler Pressure | 235 psi |
| Cylinders (dia x stroke) | 20" x 32" |
| Low Pressure Cylinders (dia x stroke) | 32" x 32" |
| Tractive Effort | 65664 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.10 |
| Heating Ability | |
| Firebox Area | 219 sq. ft |
| Grate Area | 72.20 sq. ft |
| Evaporative Heating Surface | 5585 |
| Superheating Surface | |
| Combined Heating Surface | 5585 |
| Evaporative Heating Surface/Cylinder Volume | 480.00 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 16967 |
| Same as above plus superheater percentage | 16967 |
| Same as above but substitute firebox area for grate area | 51465 |
| Power L1 | 4918.75 |
| Power MT | 194.47 |
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