Paris-Lyon-Mediterrannee 4-2-0 Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 11291)

Data from Alfred Rosling Bennett, "Crampton Locomotives on the Continent", The Railway Magazine, Vol 20 (1907), pp. 303-305.

Bennett notes that the Nord's success with its Cramptons (Locobases 621-622) led the PLM to order very similar engines from the same builder. Operating principally in front of Lyon and south expresses, they built up a reputation for fast running. Indeed, says Bennett, three years after this initial batch was introduced, the PLM ordered twelve more from Cail that were virtually identical save how the springs on the driving axle were arranged.

The first group operated for about 25 years, the second for even longer. The latter were sold to CF de l'Est and some were refitted with Flaman's over-under boiler and continued in service into the 1890s.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID11291
RailroadParis-Lyon-Mediterrannee (PLM)
Number in Class30
Road Numbers1-18, 19-30
Number Built30
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)63,934 / 29,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)82.30 / 2090
Boiler Pressure (psi / kPa)113.10 / 7.80
High Pressure Cylinders (dia x stroke) (in / mm)15.75" x 23.62" / 400x600
Tractive Effort (lbs / kg)6844 / 3104.39
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)108 - 1.969" / 50
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.32 / 3.45
Firebox Area (sq ft / m2)69.40 / 6.45
Grate Area (sq ft / m2)18.29 / 1.70
Evaporative Heating Surface (sq ft / m2)1038 / 96.50
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1038 / 96.50
Evaporative Heating Surface/Cylinder Volume194.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2069
Same as above plus superheater percentage2069
Same as above but substitute firebox area for grate area7849
Power L14034
Power MT

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