JO&S Articulated Locomotives in Austria

Class Details by Steve Llanso of Sweat House Media

Class Krassova (Locobase 11156)

Data from "Locomotive Engines at the Paris Exhibition", The Artizan (Vol II, 4th Series, #2), p. 25.

Locobase 683 describes the Engerth-Fink variation of the semi-articulated Engerth locomotive. The article referenced above noted that after the initial trials with the system, the engine was refashioned with a set of 3 coupled axles before the firebox and 2 behind, connected by a pivot joint. A similar joint connected the rear of the locomotive to the tender.

The reporter noted that the demands of the line on which these locomotives operated were considerable. The rails weighed only 48 lb/yd (24 kg/m), rose on an incline of 1 in 50 (2%), and curved as tightly as 360 ft radius. In fair weather, the report added, the engine could pull 120 tons. Locobase notes the small size of the grate.

Wikipedia's entry on the Engerth system notes that one of the four locomotives (these 3 and the Steyerdorf) lasted long enough to be given a class ID by the Hungarian State Railways and numbered 4270.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID11156
Number in Class3
Road Numbers501-502
Number Built3
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)19.27 / 5.87
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)20,608 / 9348
Weight on Drivers (lbs / kg)94,976 / 43,080
Engine Weight (lbs / kg)94,976 / 43,080
Tender Loaded Weight (lbs / kg)22,848 / 10,364
Total Engine and Tender Weight (lbs / kg)117,824 / 53,444
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)32 / 16
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)39.40 / 1000
Boiler Pressure (psi / kPa)104.40 / 7.20
High Pressure Cylinders (dia x stroke) (in / mm)18.1" x 24.9" / 460x630
Tractive Effort (lbs / kg)18,373 / 8333.86
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.17
Heating Ability
Tubes (number - dia) (in / mm)158 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.50 / 4.40
Firebox Area (sq ft / m2)78 / 7.25
Grate Area (sq ft / m2)12.50 / 1.16
Evaporative Heating Surface (sq ft / m2)1318 / 122.50
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1318 / 122.50
Evaporative Heating Surface/Cylinder Volume177.74
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1305
Same as above plus superheater percentage1305
Same as above but substitute firebox area for grate area8143
Power L11579
Power MT183.26

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