Grand Central/PLM 2-4-0 Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class 1/701/834/3 366 (Locobase 13423)

Data from the PLM Wiki vault crammed with data and plans at [], last accessed 12 November 2011. The plan comes from the 1869 PLM plan book collected by Roland Sermet.

Originally built to the same specifications (or very nearly) as a host of 2-4-0s shown in in many of the Locobase entries between 13407-13424, this class's detailed specifications come from the 1910 PLM diagram book.

In the period between 1856, when this class first arrived on the Grand Central, and 1910, the engines gave up their domeless boiler in favor of a large dome over the leading carrying axle and, later, slightly larger-diameter drivers. While the boiler was a bit smaller (although fitted with longer tubes), the locomotives' adhesion weight increased considerably.

Retirements occurred over the 1910-1928 period, a mark of how valuable these local mixed-traffic locomotives continued to be.

Principal Dimensions by Steve Llanso of Sweat House Media

Class1/701/834/3 366
Locobase ID13423
RailroadGrand Central/PLM
Number in Class16
Road Numbers1-16/701-716/843-849/3 366+
Number Built16
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)27,866 / 12,640
Weight on Drivers (lbs / kg)55,733 / 25,280
Engine Weight (lbs / kg)79,455 / 36,040
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)46 / 23
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)64.60 / 1640
Boiler Pressure (psi / kPa)127.60 / 8.80
High Pressure Cylinders (dia x stroke) (in / mm)17.72" x 23.62" / 450x600
Tractive Effort (lbs / kg)12,452 / 5648.14
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.48
Heating Ability
Tubes (number - dia) (in / mm)167 - 1.969" / 50
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)16.24 / 4.95
Firebox Area (sq ft / m2)78.58 / 7.30
Grate Area (sq ft / m2)13.46 / 1.25
Evaporative Heating Surface (sq ft / m2)1184 / 110.04
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1184 / 110.04
Evaporative Heating Surface/Cylinder Volume175.62
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1717
Same as above plus superheater percentage1717
Same as above but substitute firebox area for grate area10,027
Power L13213
Power MT254.19

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