Elsass-Lothringen 4-4-0 Locomotives in Germany

Class Details by Steve Llanso of Sweat House Media

Class A18 / S 3 (Locobase 7916)

Data from diagram Loco: 129, Societe Alsacienne de Constructions Mecaniques from locomotive book supplied by Dany Machi up at [] as

Diagrammes des machines SACM construites a GRAFENSTADEN (October 2007).

These four-cylinder de Glehn compounds were a bit bigger than the Prussian S5s of similar vintage. Their boilers had the larger-diameter, internally finned Serve tubes.

NB: The data in this entry came from a difficult-to-read diagram, but are believed to be accurate nonetheless.

Like the Prussian engines, however, they had a relatively short service life because the trains they hauled kept gaining weight.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassA18 / S 3
Locobase ID7916
Number in Class50
Road Numbers
Number Built50
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.84 / 3
Engine Wheelbase (ft / m)23.13 / 7.05
Ratio of driving wheelbase to overall engine wheelbase 0.43
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)72,752 / 32,000
Engine Weight (lbs / kg)122,577 / 55,600
Tender Loaded Weight (lbs / kg) / 46,300
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML) / 12
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) / 5
Minimum weight of rail (calculated) (lb/yd / kg/m)61 / 30.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)78 / 1980
Boiler Pressure (psi / kPa)213.20 / 14.70
High Pressure Cylinders (dia x stroke) (in / mm)13.39" x 25.2" / 340x640
Low Pressure Cylinders (dia x stroke) (in / mm)20.87" x 25.2" / 530x640
Tractive Effort (lbs / kg)14,872 / 6745.83
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.89
Heating Ability
Tubes (number - dia) (in / mm)164 - 2.76" / 65
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.11 / 4.30
Firebox Area (sq ft / m2)122.17 / 11.35
Grate Area (sq ft / m2)24.54 / 2.28
Evaporative Heating Surface (sq ft / m2)1770 / 164.45
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1770 / 164.45
Evaporative Heating Surface/Cylinder Volume430.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5232
Same as above plus superheater percentage5232
Same as above but substitute firebox area for grate area26,047
Power L16614
Power MT400.85

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