Data from [], 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 | |
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Class | 150 A65 |
Locobase ID | 2525 |
Railroad | Paris-Orleans |
Country | France |
Whyte | 2-10-0 |
Number in Class | 70 |
Road Numbers | 6001-6070 |
Gauge | Std |
Number Built | 70 |
Builder | several |
Year | 1910 |
Valve Gear | Walschaert |
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 Volume | 297.63 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 9313 |
Same as above plus superheater percentage | 11,362 |
Same as above but substitute firebox area for grate area | 45,153 |
Power L1 | 11,111 |
Power MT | 713.16 |