Data from the [] datasheet, last accessed 31 January 2012. Works numbers were 12347-12
The engines were delivered to the complex of rail lines connecting the 13 mines, 6 smelters, and 2 transfer stations. Like other narrow-gauge lines in Germany, the MBB used "rollwagens" to carry standard-gauge freight cars on a platform rolling on trucks that ran on the 750-mm gauge line. At the transfer stations, these cars would roll off the rollwagen and onto their own wheels.
Note the square cylinder dimensions. The datasheet illustration shows a big, burly narrow-gauge engine.
The 7 was sold to the Rugener, but the others remained in service throughout World War II, transferred their flag to East Germany, and continued working for decades.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | K44.9 |
| Locobase ID | 13806 |
| Railroad | Mansfelder BergwerksBahn (MBB)` |
| Country | Germany |
| Whyte | 0-8-0T |
| Number in Class | 6 |
| Road Numbers | 6-11 |
| Gauge | 75 cm |
| Number Built | 6 |
| Builder | Orenstein & Koppel |
| Year | 1931 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.84 / 3 |
| Engine Wheelbase (ft / m) | 9.84 / 3 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 21,385 / 9700 |
| Weight on Drivers (lbs / kg) | 82,012 / 37,200 |
| Engine Weight (lbs / kg) | 82,012 / 37,200 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1030 / 3.90 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.90 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 34 / 17 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 31.50 / 800 |
| Boiler Pressure (psi / kPa) | 227.70 / 1570 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15.75" x 15.75" / 400x400 |
| Tractive Effort (lbs / kg) | 24,006 / 10888.95 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.42 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 74 - 2.756" / 70 |
| Flues (number - dia) (in / mm) | 12 - 1.772" / 45 |
| Flue/Tube length (ft / m) | 9.19 / 2.80 |
| Firebox Area (sq ft / m2) | 64.58 / 6 |
| Grate Area (sq ft / m2) | 16.15 / 1.50 |
| Evaporative Heating Surface (sq ft / m2) | 606 / 56.30 |
| Superheating Surface (sq ft / m2) | 280 / 26 |
| Combined Heating Surface (sq ft / m2) | 886 / 82.30 |
| Evaporative Heating Surface/Cylinder Volume | 170.63 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3677 |
| Same as above plus superheater percentage | 4854 |
| Same as above but substitute firebox area for grate area | 19,410 |
| Power L1 | 11,609 |
| Power MT | 1248.28 |