Paris-Orleans 2-10-0 Locomotives in France


Class Details by Steve Llanso of Sweat House Media

Class 150 A65 (Locobase 2525)

Data from [link], a description of the class, says that the PO was not only the first railway in Europe to introduce a 4-6-2 class, but also the first in France to operate a "Decapode". See also J B Flamme, Les Chemins de Fer a l'Exposition de Bruxelles (Paris: H Dunod et Pinat, 1911), p. 46.

The accompanying photo shows a Belpaire firebox behind a high-pitched boiler with three domes, a steam dome flanked by two sand boxes.

Although the account says that the design suffered from constricted steam passages and a poorly designed regulator, the 70 engines specialized in the difficult grades from Limoges to Montauban. They were also the only 2-10-0s that worked passenger service in those same years, particularly up the 3.3% grades from la Bourbole to Mont-Dore.

Principal Dimensions by Steve Llanso of Middle Run Media
Class150 A65
Locobase ID2525
RailroadParis-Orleans
CountryFrance
Whyte2-10-0
Number in Class70
Road Numbers6001-6070
GaugeStd
Number Built70
Builderseveral
Year1910
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)21 / 6.40
Engine Wheelbase (ft / m)28.38 / 8.65
Ratio of driving wheelbase to overall engine wheelbase 0.74
Overall Wheelbase (engine & tender) (ft / m)49.90 / 15.21
Axle Loading (Maximum Weight per Axle) (lbs / kg)35,935 / 16,300
Weight on Drivers (lbs / kg)171,740 / 77,900
Engine Weight (lbs / kg)187,834 / 85,200
Tender Loaded Weight (lbs / kg)68,674 / 31,150
Total Engine and Tender Weight (lbs / kg)256,508 / 116,350
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)57 / 28.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55.10 / 1400
Boiler Pressure (psi / kPa)227.70 / 1570
High Pressure Cylinders (dia x stroke) (in / mm)18.11" x 24.41" / 460x620
Low Pressure Cylinders (dia x stroke) (in / mm)25.98" x 25.59" / 660x650
Tractive Effort (lbs / kg)38,430 / 17431.58
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.47
Heating Ability
Tubes (number - dia) (in / mm)184 - 1.772" / 45
Flues (number - dia) (in / mm)24 - 4.921" / 125
Flue/Tube length (ft / m)17.22 / 5.25
Firebox Area (sq ft / m2)162.54 / 15.10
Grate Area (sq ft / m2)40.90 / 3.80
Evaporative Heating Surface (sq ft / m2)2166 / 201.20
Superheating Surface (sq ft / m2)596 / 55.40
Combined Heating Surface (sq ft / m2)2762 / 256.60
Evaporative Heating Surface/Cylinder Volume297.63
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9313
Same as above plus superheater percentage11,362
Same as above but substitute firebox area for grate area45,153
Power L111,111
Power MT713.16

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