This class was built for the French government (Commission Internationale de Ravitaillement, also known as the Mission Hauser) to operate on its tactical light railways (those serving the front lines). A Decauville design entered production as soon as World War I began and continued until the Armistice more than four years later. Although Decauville built the lion's share -- 320 locomotives -- other builders took up the slack between supply and demand.
Kerr Stuart of Great Britain, which produced 70 engines in three batches; see Locobase 20555..
[] -- which represented a group attempting to restore a surviving Joffre (3014) -- supplied all the information in this entry. After service in the French Army, 3014 was demobbed and sold, eventually arriving at a stone quarry (Societe Anonyme des CarriFres de la Vale Heureuse et du Haut Banc, Marquise Rinxent, Pas de Calais) as close to home as could be. It stopped operating sometime before 1956 and was acquired in 1974. Recconditioning began in 1998.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | 8T/Joffre |
Locobase ID | 3314 |
Railroad | Trench railways |
Country | France |
Whyte | 0-6-0T |
Number in Class | 320 |
Road Numbers | |
Gauge | 60 cm |
Number Built | 320 |
Builder | Decauville |
Year | 1914 |
Valve Gear | |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 4.59 / 1.40 |
Engine Wheelbase (ft / m) | 4.59 / 1.40 |
Ratio of driving wheelbase to overall engine wheelbase | 1 |
Overall Wheelbase (engine & tender) (ft / m) | 4.59 / 1.40 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 23,296 / 10,567 |
Engine Weight (lbs / kg) | 23,296 / 10,567 |
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) | 0.60 / 1 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 13 / 6.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 23.60 / 599 |
Boiler Pressure (psi / kPa) | 181.30 / 1250 |
High Pressure Cylinders (dia x stroke) (in / mm) | 8.5" x 10.98" / 216x279 |
Tractive Effort (lbs / kg) | 5180 / 2349.61 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.50 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 74 - 1.575" / 40 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 5.41 / 1.65 |
Firebox Area (sq ft / m2) | 23.25 / 2.16 |
Grate Area (sq ft / m2) | 3.98 / 0.37 |
Evaporative Heating Surface (sq ft / m2) | 189 / 17.57 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 189 / 17.57 |
Evaporative Heating Surface/Cylinder Volume | 262.09 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 722 |
Same as above plus superheater percentage | 722 |
Same as above but substitute firebox area for grate area | 4215 |
Power L1 | 3019 |
Power MT | 857.11 |