Paris-Orleans 4-4-0 Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class C.20 (Locobase 3895)

Data taken from Edouard Sauvage, "Four-Cylinder Compound Locomotives in France", Railroad Gazette, Volume XXXII [32], No.39 (28 September 1900), pp. 629-631 using information compiled through direct communications with the various designers.

This design is virtually identical to the Sud and Midi compounds of the same vintage.

See also the table presented on pages 369, 371 of the Groupe VI. - GTnie civil. - Moyens de transport. DeuxiFme partie. Classes 32 (Tome I), part of the series of Rapports du Jury Internationale of the Exposition Unverselle Internationale de 1900 Paris Exposition, hosted on the website of Le Conservatoire numTrique des Arts & MTtiers ([], accessed 21 August 2005).

According to La Nature of the same year, the design cut the time to run between Paris and Bordeaux from 8 hrs 14 minutes to 7 hrs 5 min, averaging 82 km /h (51 mph). Paris to Nantes was cut from 7:23 to 5:25 at an average speed of 79 km/h (49 mph).

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID3895
Number in Class20
Road Numbers1-20
Number Built20
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)24.60 / 7.50
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)73,855 / 33,500
Engine Weight (lbs / kg)121,254 / 55,000
Tender Loaded Weight (lbs / kg)84,657 / 38,400
Total Engine and Tender Weight (lbs / kg)205,911 / 93,400
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)5 / 5
Minimum weight of rail (calculated) (lb/yd / kg/m)62 / 31
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)82.30 / 2090
Boiler Pressure (psi / kPa)217.60 / 15
High Pressure Cylinders (dia x stroke) (in / mm)13.75" x 25.13" / 349x638
Low Pressure Cylinders (dia x stroke) (in / mm)21.63" x 25.13" / 549x638
Tractive Effort (lbs / kg)15,209 / 6898.69
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.86
Heating Ability
Tubes (number - dia) (in / mm)111 - 2.75" / 70
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.80 / 3.90
Firebox Area (sq ft / m2)132.78 / 12.34
Grate Area (sq ft / m2)26.50 / 2.46
Evaporative Heating Surface (sq ft / m2)1861 / 172.96
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1861 / 172.96
Evaporative Heating Surface/Cylinder Volume430.90
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5766
Same as above plus superheater percentage5766
Same as above but substitute firebox area for grate area28,893
Power L17051
Power MT420.95

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