Data from Albert Gieseler at [], last accessed 9 May 2011.
[] (24 September 2003) says that this was a one-off trial of a firebox that burned brown-coal briquettes. Was this effectively a charcoal burner? Although the engine operated well enough, there wasn't much of an advantage apparently as it was converted to coal burning by 1958.
Data from [], last accessed 9 May 2011. See also "Coal Dust Powered Steam Engines" on the Railways Matters website at [], last accessed 30 September 2023.
Designed by Hans Wendler to burn pulverized fuel, this engine had a narrow firebox with no combustion chamber. Although the East Germans claimed it showed a performance to be "significantly higherr than a conventionally fired locomotive, the effort was a one-time experiment.
Wendler later installed his coal-dust firing system in 20 East German Class 44 2-10-0s
A[nthony] E[dward] Durrant, The steam locomotives of Eastern Europe (Abbot Newton: David & Charles, 1966)
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | BR 25 | BR 25 10 |
| Locobase ID | 1702 | 1703 |
| Railroad | Deutsche Reichsbahn | Deutsche Reichsbahn |
| Country | East Germany | East Germany |
| Whyte | 2-8-0 | 2-8-0 |
| Number in Class | 1 | 2 |
| Road Numbers | 25 001 | 25 1001 |
| Gauge | Std | Std |
| Number Built | 1 | 1 |
| Builder | LKM Babelsberg | LKM Babelsberg |
| Year | 1954 | 1954 |
| Valve Gear | Heusinger | |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | ||
| Engine Wheelbase (ft / m) | 31.82 / 9.70 | 31.82 / 9.70 |
| 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) | 157,696 / 71,530 | 161,279 / 73,155 |
| Engine Weight (lbs / kg) | 192,865 / 87,482 | 199,359 / 90,428 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | ||
| Tender Water Capacity (gals / ML) | 7920 / 30 | 7260 / 27.50 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 11 / 10 | 12.70 / 12 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 66 / 33 | 67 / 33.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 63 / 1600 | 63 / 1600 |
| Boiler Pressure (psi / kPa) | 232.10 / 1600 | 232.10 / 1600 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 23.58" x 25.98" / 599x660 | 23.62" x 25.98" / 600x660 |
| Tractive Effort (lbs / kg) | 45,236 / 20518.73 | 45,389 / 20588.13 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.49 | 3.55 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 132 - 2.008" / 51 | 146 - 1.772" / 45 |
| Flues (number - dia) (in / mm) | 35 - 5.236" / 133 | 35 - 5.236" / 133 |
| Flue/Tube length (ft / m) | 15.42 / 4.70 | 14.27 / 4.35 |
| Firebox Area (sq ft / m2) | 188.30 / 17.50 | 215.20 / 20 |
| Grate Area (sq ft / m2) | 41.64 / 3.87 | 40.46 / 3.76 |
| Evaporative Heating Surface (sq ft / m2) | 1849 / 171.80 | 1707 / 158.60 |
| Superheating Surface (sq ft / m2) | 647 / 60.10 | 699 / 65 |
| Combined Heating Surface (sq ft / m2) | 2496 / 231.90 | 2406 / 223.60 |
| Evaporative Heating Surface/Cylinder Volume | 140.81 | 129.56 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 9665 | 9391 |
| Same as above plus superheater percentage | 12,177 | 12,114 |
| Same as above but substitute firebox area for grate area | 55,068 | 64,433 |
| Power L1 | 15,986 | 16,784 |
| Power MT | 893.95 | 917.72 |