Wurttembergische 2-4-2 Locomotives in Germany


Class Details by Steve Llanso of Sweat House Media

Class E (Locobase 5692)

Data from "Some Engines of the German Railway Union," American Engineer and Railroad Journal, Vol LXVIII, No 7 (July 1894), pp. 308, 310.

This class had several unusual features. It used an rare wheel arrangement and could be run either as a 3-cylinder simple engine or, as outlined in the specs, a Smith-type 3-cylinder compound in which the two LP cylinders were each the same size as the one HP cylinder. (Interestingly, Smith's "pioneering" design came out in 1898, 4 years after this class entered service.)

The AERJ article explains that steam from the boiler first entered a steam chest above the middle, inside cylinder. If the train was being run as a simple-expansion engine, the valves let live steam into all 3 cylinders; the tractive effort calculates to 20,589 lb in that configuration. When running compound, a valve in the steam chest limited the steam pressure to the outside valves to 1/2 the MEP of the center cylinder. Valve gear was a mixture of Walschaerts on the center cylinder, Allan on the two outside cylinders.

The profile showed a long, straight boiler, and short stack with a thick cap. The class was rated at 150 trailing tons up a continuous 1% grade (AERJ says 10%, but that's a misunderstanding of the continental mm/metre measurement) at 60 km/h (37 mph).

Principal Dimensions by Steve Llanso of Middle Run Media
ClassE
Locobase ID5692
RailroadWurttembergische (Wurttemberg) Staatsbahn
CountryGermany
Whyte2-4-2
Number in Class10
Road Numbers401-410
GaugeStd
Number Built10
BuilderCockerill
Year1892
Valve Gearmixed
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)19.03 / 5.80
Ratio of driving wheelbase to overall engine wheelbase 0.37
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)30,424 / 13,800
Weight on Drivers (lbs / kg)60,848 / 27,600
Engine Weight (lbs / kg)119,490 / 54,200
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)2640 / 10
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)65 / 1650
Boiler Pressure (psi / kPa)174 / 1200
High Pressure Cylinders (dia x stroke) (in / mm)16.54" x 22.05" / 420x560 (1)
Low Pressure Cylinders (dia x stroke) (in / mm)16.54" x 22.05" / 420x560
Tractive Effort (lbs / kg)10,294 / 4669.29
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.91
Heating Ability
Tubes (number - dia) (in / mm)250 - 1.625" / 41
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.11 / 4.30
Firebox Area (sq ft / m2)103.30 / 9.60
Grate Area (sq ft / m2)21.52 / 2
Evaporative Heating Surface (sq ft / m2)1594 / 148.10
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1594 / 148.10
Evaporative Heating Surface/Cylinder Volume581.38
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3744
Same as above plus superheater percentage3744
Same as above but substitute firebox area for grate area17,974
Power L17255
Power MT525.72

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