le Dauphine / PLM 2-4-0 Locomotives in France


Class Details by Steve Llanso of Sweat House Media

Class 737 / 850 / 3 375 (Locobase 13424)

Data from the PLM Wiki vault crammed with data and plans at [], last accessed 12 November 2011.

Six-wheelers for local mixed traffic all had the same specifications when they were delivered to different railways in 1854-1860. These lines would all come together under the PLM banner before too long.

Like the others, these 2 Le Dauphine locomotives would receive a dome in 1873, have a pressure upgrade in a boiler with longer tubes of a slightly lower count, and roll on slightly larger drivers. And like the others, they would operate into the 1920s. See the Grand Centrals as modified by the PLM at Locobase 13424 for the specifications of the later version of all of these 2-4-0s.

Principal Dimensions by Steve Llanso of Sweat House Media

Class737 / 850 / 3 375
Locobase ID13424
Railroadle Dauphine / PLM
CountryFrance
Whyte2-4-0
Number in Class2
Road Numbers737-738 / 850-851 / 3 375-3 376
GaugeStd
Number Built2
BuilderParent & Schaken
Year1857
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 5.71 / 1.74
Engine Wheelbase (ft / m)11.52 / 3.51
Ratio of driving wheelbase to overall engine wheelbase 0.50
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)26,588 / 12,060
Weight on Drivers (lbs / kg)53,175 / 24,120
Engine Weight (lbs / kg)75,111 / 34,070
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 1600
Boiler Pressure (psi / kPa)113.10 / 7.80
High Pressure Cylinders (dia x stroke) (in / mm)17.72" x 23.62" / 450x600
Tractive Effort (lbs / kg)11,317 / 5133.31
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.70
Heating Ability
Tubes (number - dia) (in / mm)178 - 1.969" / 50
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.94 / 4.25
Firebox Area (sq ft / m2)81.91 / 7.61
Grate Area (sq ft / m2)13.46 / 1.25
Evaporative Heating Surface (sq ft / m2)1259 / 116.94
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1259 / 116.94
Evaporative Heating Surface/Cylinder Volume186.74
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1522
Same as above plus superheater percentage1522
Same as above but substitute firebox area for grate area9264
Power L12939
Power MT243.70

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