LKM Babelsberg Typ 225 PS Schmalspur
German Reichsbahn class 9933
Germany 1950 21 produced
Between 1950 and 1952, LKM at Babelsberg built 21 0-8-0T tank locomotives for a gauge of 900 mm. They were mainly intended for customers in the industry, like Wismut and for lignite mining. For ease of maintenance, they had no superheater and additionally, they were designed for the firing of lignite. Due to the small drivers and long overhangs, top speed was limited to 35 km/h or 22 mph. Despite this, three were bought by the Reichsbahn in 1958 for use on the Molli railway that connects Bad Doberan to the sea spa of Kühlungsborn. They became class 9933. Two of these were superheated in 1961 and one is still operational and used in times of high demand.
Technical data
General
| Property | as built | rebuilt 1961 |
|---|---|---|
| Built | 1950-1952 | 1961 |
| Manufacturers | LKM Babelsberg | RAW Görlitz |
| Wheel arrangement | 0-8-0T (Eight-coupled) | |
| Gauge | 900 mm | |
Dimensions and weights
| Property | as built | rebuilt 1961 |
|---|---|---|
| Length | 8.86 m | |
| Wheelbase | 3.00 m | |
| Empty mass | 24.8 t | 25 t |
| Service mass | 32 t | 32.4 t |
| Adhesion mass | 32 t | 32.4 t |
| Rigid wheelbase | 3.00 m | |
| Axle load | 8 t | 8.1 t |
| Water capacity | 3,400 l | |
| Fuel capacity | 2.2 t (coal) | |
Boiler
| Property | as built | rebuilt 1961 |
|---|---|---|
| Grate area | 1.6 m² | |
| Firebox surface | 6.04 m² | |
| Tube heating surface | 48.4 m² | 36.85 m² |
| Evaporative heating surface | 54.8 m² | 42.89 m² |
| Total heating surface | 54.8 m² | 60.9 m² |
| Superheater surface | 18 m² | |
Power plant
| Property | as built | rebuilt 1961 |
|---|---|---|
| Driver diameter | 800 mm | |
| Boiler pressure | 14 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 370 x 400 mm | |
Power
| Property | as built | rebuilt 1961 |
|---|---|---|
| Power source | steam | |
| Indicated power | 250 kW (340 PS) | 338 kW (460 PS) |
| Top speed | 35 km/h | |
| Starting effort | 81.5 kN | |
Calculated values
| Property | as built | rebuilt 1961 |
|---|---|---|
| Factor of adhesion | 1 : 3.85 | 1 : 3.90 |
| Optimal speed | 19 km/h | 26 km/h |
| Power-to-weight ratio | 7.8 kW/t | 10.4 kW/t |
| Heating Surface Equivalent | 84.6 m² | 109.1 m² |
| Cylinder volume/HSE | 1 : 1,016.27 | 1 : 788.49 |
| Adhesive weight/Total | 1 : 1.00 | |
| Tractive force/Heating surface | 1 : 31.04 | 1 : 27.94 |
| Grate area/Heating surface | 1 : 34.25 | 1 : 38.06 |
| Firebox/Tube surface | 1 : 8.01 | 1 : 6.10 |
| Total/Superheater | 1 : 2.38 | |
