Wilhelm Engerth's coupled-tender drive had limitations on mountainous rail lines such as those of the Jassenova, Oravicza, and Steierdorf railroad of Hungary. He and Pius Fink, therefore, developed a kinematic linkage designed to drive the tender axles while conferring great flexibility. A second connecting rod led from the last axle of the driver set to a crank positioned over the first tender axle. An inclined rod near the crank's hub linked these crank bearings to the third axle to keep them in line. At the end of the crank arm was a shorter rod connecting the upper crank to a crank on the hub of the first tender axle. Viewing the action from the side revealed three cranks, 2 on the same level and 1 above, each rotating around its own axis and kept in harmony by the series of connecting rods.
Although complicated, the system worked well on the 4 engines produced for the railroad. the latter 3 were of a modified design that is described in Locobase 11156.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Steierdorf |
| Locobase ID | 683 |
| Railroad | JO&S |
| Country | Hungary |
| Whyte | 0-6-4-0 |
| Number in Class | 4 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 4 |
| Builder | Engerth-Fink |
| Year | 1862 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 93,712 / 42,507 |
| Engine Weight (lbs / kg) | 93,712 / 42,507 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 93,712 / 42,507 |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 31 / 15.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 39.40 / 1000 |
| Boiler Pressure (psi / kPa) | 104.40 / 720 |
| 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) | 5.10 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 15.50 / 1.44 |
| Evaporative Heating Surface (sq ft / m2) | 1307 / 121.47 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1307 / 121.47 |
| Evaporative Heating Surface/Cylinder Volume | 176.26 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1618 |
| Same as above plus superheater percentage | 1618 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |