Breton Articulated Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class E 401 (Locobase 7599)

Data from a site that reproduces cigarette card pictures and adds dimension and area data -- [], last accessed 14 June 2006. Works numbers were 4654-4660 in 1895.

These seven tank Mallets were supplied as a batch and operated on the line for almost 60 years. 402-403 & 407 were withdrawn in 1954, the other four in the first half of 1956.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassE 401
Locobase ID7599
Number in Class7
Road Numbers401-407
Number Built7
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)17.29 / 5.27
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)17.29 / 5.27
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)78,264 / 35,500
Engine Weight (lbs / kg)78,264 / 35,500
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)78,264 / 35,500
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)39.80 / 1010
Boiler Pressure (psi / kPa)174 / 12
High Pressure Cylinders (dia x stroke) (in / mm)11.81" x 19.69" / 300x500
Low Pressure Cylinders (dia x stroke) (in / mm)15.75" x 19.69" / 400x500
Tractive Effort (lbs / kg)13,065 / 5926.19
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.99
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)10.98 / 1.02
Evaporative Heating Surface (sq ft / m2)699 / 65
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)699 / 65
Evaporative Heating Surface/Cylinder Volume280.00
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1911
Same as above plus superheater percentage1911
Same as above but substitute firebox area for grate area
Power L1
Power MT

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