Feldbahn Articulated Locomotives in Germany
Class Details by Steve Llanso of Sweat House Media
Class Zwilling (Locobase 4870)
Data from [
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Twin locomotives were two locomotives bolted back-to-back and run by one crew. The data are for the two engines combined, which conveys just how small the locomotives were. They could be run separately, but carried the same number; the A engine had a taller cab than the B. Each appeared as a caricature of engine design -- tiny wheels, tall cylindrical dome, spark-arresting stack that looked like an ashtray in a hotel lobby ...
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Zwilling |
| Locobase ID | 4870 |
| Railroad | Feldbahn |
| Country | Germany |
| Whyte | 0-6+6-0 |
| Number in Class | 182 |
| Road Numbers | |
| Gauge | 60 cm |
| Number Built | 182 |
| Builder | Henschel & Sohn |
| Year | 1894 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 4.25 / 1.30 |
| 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) | 38,080 / 17,273 |
| Engine Weight (lbs / kg) | 38,080 / 17,273 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 366 / 1.39 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.50 / 1 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 11 / 5.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 23.30 / 592 |
| Boiler Pressure (psi / kPa) | 174 / 1200 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 7.09" x 9.45" / 180x240 (4) |
| Tractive Effort (lbs / kg) | 6031 / 2735.62 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.31 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 32.20 / 2.99 |
| Grate Area (sq ft / m2) | 8.60 / 0.80 |
| Evaporative Heating Surface (sq ft / m2) | 420 / 39.03 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 420 / 39.03 |
| Evaporative Heating Surface/Cylinder Volume | 486.32 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1496 |
| Same as above plus superheater percentage | 1496 |
| Same as above but substitute firebox area for grate area | 5603 |
| Power L1 | 4546 |
| Power MT | 1579.13 |