Tramway 0-4-0 Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 11335)

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 Sweat House Media

Locobase ID11335
Number in Class2
Road Numbers
Number Built2
Valve GearStephenson
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 wheelbase1
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 / 11.70
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 Volume804.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation602
Same as above plus superheater percentage602
Same as above but substitute firebox area for grate area4546
Power L14502
Power MT1286.31

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