Librairie polytechnique, Baudry et Cie, p 380. Baldwin works #12433, 12672, 12676, 12679-80, 13370, 13408-09, 13411-13413. Additional data from 1907 Catalogue of Mechanical Engineering Collection in the Science Division of the Victoria & Albert Museum (Board of Education South Kensington)., pp 92.
As unusual as the adoption of the Bicycle wheel arrangement was in the US, production of 10 Bicycles with the 4-cylinder Vauclain compound layout was rarer still. They didn't persist in this arrangement for long. One (682) was rebuilt as an Atlantic in May 1899, the others as N-4a camelback Moguls in 1904.
Even then, 5 were scrapped within a few years, while 4 underwent a further transformation as L-6a class 4-6-0s. In only one instance did an engine survive past 1911: 682 (now 315) was rebuilt again as a 4-6-0 (class L-6b) and operated until 1927.
| Specifications | |
|---|---|
| Class | M1-a/M1-b |
| Locobase ID | 8879 |
| Railroad | Reading |
| Whyte | 2-4-2 |
| Road Numbers | 618-622, 679-684 |
| Gauge | Std |
| Builder | Burnham, Williams & Co |
| Year | 1892 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase | 7.50' |
| Engine Wheelbase | 23.25' |
| Ratio of driving wheelbase to overall engine wheebase | 0.32 |
| Overall Wheelbase (engine & tender) | |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 84023 lbs |
| Engine Weight | 131748 lbs |
| Tender Light Weight | 92000 lbs |
| Total Engine and Tender Weight | 223748 lbs |
| Tender Water Capacity | 4755 gals |
| Tender Fuel Capacity (oil/coal) | 5.5 tons |
| Minimum weight per yard of rail on which locomotive could run | 70 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 78" |
| Boiler Pressure | 180 psi |
| Cylinders (dia x stroke) | 13" x 26" |
| Low Pressure Cylinders (dia x stroke) | 22" x 26" |
| Tractive Effort | 12777 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.58 |
| Heating Ability | |
| Firebox Area | 173.46 sq. ft |
| Grate Area | 76 sq. ft |
| Evaporative Heating Surface | 1435 |
| Superheating Surface | |
| Combined Heating Surface | 1435 |
| Evaporative Heating Surface/Cylinder Volume | 359.27 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 13680 |
| Same as above plus superheater percentage | 13680 |
| Same as above but substitute firebox area for grate area | 31223 |
| Power L1 | 4710 |
| Power MT | 247.16 |
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