Herault Articulated Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 11452)

Data from M. A Mallet, " The Development of the Compound System in Locomotives," The Railroad and Engineering Journal, Vol LXV, No 5 (May 1891), pp. 202-204.

The Compagnie de Chemins de Fer de l'Herault developed independently of the network encouraged by the Freycinet Plan adopted in 1878. Instead, local interests felt distinctly ignored by both the PLM and the Midi.

A separate building project led to a line between Montpellier and Palavas being opened in 1872. Other segments followed, but the system was not well funded and long gaps between openings. Nevertheless, the Herault included 212 km (132 miles) of line at its peak in 1912.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID11452
Number in Class1
Road Numbers
Number Built1
Valve Gearvarious
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.76 / 1.45
Engine Wheelbase (ft / m)16.40 / 5
Ratio of driving wheelbase to overall engine wheelbase 0.29
Overall Wheelbase (engine & tender) (ft / m)16.40 / 5
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)77,100 / 34,972
Engine Weight (lbs / kg)77,100 / 34,972
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)77,100 / 34,972
Tender Water Capacity (gals / ML)1109 / 4.20
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)32 / 16
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)47.20 / 1200
Boiler Pressure (psi / kPa)169.70 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)12.01" x 20.47" / 305x520
Low Pressure Cylinders (dia x stroke) (in / mm)18.11" x 20.47" / 460x520
Tractive Effort (lbs / kg)12,534 / 5685.33
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.15
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)69.94 / 6.50
Grate Area (sq ft / m2)15.60 / 1.45
Evaporative Heating Surface (sq ft / m2)823 / 76.50
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)823 / 76.50
Evaporative Heating Surface/Cylinder Volume306.63
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2647
Same as above plus superheater percentage2647
Same as above but substitute firebox area for grate area11,869
Power L12565
Power MT293.38

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