Ouest 2-8-0 Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class 4501 / 140A (Locobase 6066)

Data from I N Jevica's [] (visited 29 May 2004) and [] (visited November 2002) by Roland Arzul.

Called "Italians", these von Borries cross-compound Consolidations were the first French engines to be fitted with the Zara truck, which combined the leading truck with the first coupled axle. They had dramatically high-pitched boilers, the impression accentuated by the tall valve-cylinder casting.

According to Arzul, the 4501's procurement resulted from a sudden realization that increased train loads were overwhelming the six-coupleds then in service in Brittany and Normandy. The result was a freight-hauler with small drivers limited to 60 km/h (38 mph), but offering a solid increase in power for the grade.

Ultimately, they were replaced in their initial service by larger Consolidations, notably those of American design, but many served for decades more.

Principal Dimensions by Steve Llanso of Sweat House Media

Class4501 / 140A
Locobase ID6066
Number in Class30
Road Numbers4501-4530 / 140A-001 to 30
Number Built30
BuilderHenschel & Sohn
Valve GearWalschaert
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)145,505 / 66,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)3960 / 15
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 5.50 / 5
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)53.90 / 1370
Boiler Pressure (psi / kPa)232.10 / 16
High Pressure Cylinders (dia x stroke) (in / mm)19.29" x 27.56" / 490x700 (1)
Low Pressure Cylinders (dia x stroke) (in / mm)29.53" x 27.56" / 750x700 (1)
Tractive Effort (lbs / kg)26,309 / 11933.58
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)135.63 / 12.60
Grate Area (sq ft / m2)30.14 / 2.80
Evaporative Heating Surface (sq ft / m2)2185 / 203.03
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2185 / 203.03
Evaporative Heating Surface/Cylinder Volume468.77
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6995
Same as above plus superheater percentage6995
Same as above but substitute firebox area for grate area31,480
Power L15465
Power MT

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