DR Class 22

DR Class 22
Number(s) 22 001–085
Quantity 85
Manufacturer Raw Meiningen
Year(s) of manufacture 1958–1962
Retired 1971
Wheel arrangement 2-8-2
Axle arrangement 1'D1' h3
Type P 46.18
Gauge 1,435 mm (4 ft 8 1⁄2 in)
Length over buffers 23,700 mm
Service weight 107.5 t
Adhesive weight 74.0 t
Axle load 18.7 t
Top speed 110 km/h
Indicated Power 1,690 PS
Driving wheel diameter 1,750 mm
Leading wheel diameter 1,000 mm
Trailing wheel diameter 1,100 mm
Valve gear outside valve gear with Winterthur slide
No. of cylinders 3
Cylinder bore 520 mm
Piston stroke 660 mm
Boiler Overpressure 16 bar
Grate area 4.23 m²
Radiative heating area 21.3 m²
Superheater area 83.80 m²
Evaporative heating area 206.30 m²
Tender 2'2' T 32/34 (22 001 with 2`2 T30 from 25 001)
Water capacity 32.0/34.0 m³ (22 001 30 m³)
Fuel 10 t stone coal
Train heating Steam
Features 22 001 was given a Knorr feedwater heater and Riggenbach counter-pressure brake instead of the MV equipment

The steam locomotives of DR Class 22 were reconstructed passenger train locomotives in service with the Deutsche Reichsbahn in East Germany after the Second World War.

These engines were rebuilt from DRG Class 39.0-2 locomotives and appeared between 1958 and 1962 as part of the reconstruction programme. The latter had a significant problem: the boiler did not generate enough steam and the steam pipes were too winding, which considerably reduced the maximum power of the engine. A total of 85 examples were equipped with a new combustion-chambered boiler with an IfS mixer-preheater. The locomotive frame had to be extended to accommodate the new engine. The wider outer firebox meant that the driver's cab needed a modified rear wall. The locomotives were given operating numbers 22 001–085 and were mainly homed in the Reichsbahn divisions of Dresden and Erfurt.

The DR employed the locomotives on heavy express train duties in the schedules for the DRG Class 01, which led to overloading of the original components (frame cracks, piston damage). As a result, early retirement followed. In 1968, 50 of the 85 Reko boilers from the Class 22 were used for the reconstruction of the DRG Class 03.

In 1970 the engines were allocated to Class 39 under the DR's new computerised numbering scheme. However, in 1970 only a few machines were still working, at Halberstadt and Saalfeld. In 1971 the last one was withdrawn. Up to the early 1990s, nine engines were used as steam generators.

The vehicles were equipped with 2'2' T 32 or 2'2' T 34 tenders.

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