Data from Anatole Mallet, Etude sur L'Utilisation de la Vapeur dans les Locomotives et L'Application a ces Machines du Fonctionnement Compound (Paris: Librairie Polytechnique Ch. Beranger, Ed, 1878), especially pp. 126-131.
Swiss Anatole Mallet promoted his two-cylinder compound system for every application that seemed appropriate. In addition to the light-rail tank locomotives for which he had quickly become famous, Mallet also suggested that tramways adopt the system for use with the vertical-boilered tram motors that were going into service on many city tram systems.
The idea appears not to have clicked with potential buyers. Except for the larger articulateds, tram locomotives were simple-expansion engines. Indeed, Mallet's name would be most readily associated with locomotives at the other end of the spectrum in very large locomotives with long, horizontal boilers under which 2 high-pressure cylinders would drive one engine and 2 much larger low-pressure cylinders would drive the other.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | unknown |
| Locobase ID | 11335 |
| Railroad | Tramway |
| Country | France |
| Whyte | 0-4-0T |
| Number in Class | 2 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 2 |
| Builder | |
| Year | 1878 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 4.27 / 1.30 |
| Engine Wheelbase (ft / m) | 4.27 / 1.30 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 4.27 / 1.30 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 15,432 / 7000 |
| Engine Weight (lbs / kg) | 15,432 / 7000 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 264 / 1 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 13 / 6.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 27.60 / 700 |
| Boiler Pressure (psi / kPa) | 169.70 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 5.91" x 12.6" / 150x320 (1) |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 9.45" x 12.6" / 240x320 (1) |
| Tractive Effort (lbs / kg) | 1653 / 749.79 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 9.34 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 49 - 1.772" / 45 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 6.17 / 1.88 |
| Firebox Area (sq ft / m2) | 26.79 / 2.49 |
| Grate Area (sq ft / m2) | 3.55 / 0.33 |
| Evaporative Heating Surface (sq ft / m2) | 161 / 14.92 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 161 / 14.92 |
| Evaporative Heating Surface/Cylinder Volume | 804.89 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 602 |
| Same as above plus superheater percentage | 602 |
| Same as above but substitute firebox area for grate area | 4546 |
| Power L1 | 4502 |
| Power MT | 1286.31 |