DR Class 22

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.

DR Class 22
Type and origin Builder RAW Meiningen Build date 1958–1962 Total produced 85
Specifications Configuration: ​  • Whyte 2-8-2  • German P 46.18 Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 1,000 mm (3 ft 3+1⁄4 in) Driver dia. 1,750 mm (5 ft 8+7⁄8 in) Trailing dia. 1,100 mm (3 ft 7+1⁄4 in) Length: ​  • Over beams 23,700 mm (77 ft 9 in) Axle load 18.7 tonnes (18.4 long tons; 20.6 short tons) Adhesive weight 74.0 tonnes (72.8 long tons; 81.6 short tons) Service weight 107.5 tonnes (105.8 long tons; 118.5 short tons) Tender type 2′2′ T 32/34 (22 001 with 2′2 T30 from 25 001) Fuel capacity Hard coal: 10 tonnes (9.8 long tons; 11 short tons) Water cap. 2′2′ T 32: 32.0 m3 (1,130 cu ft) or 32,000 litres (7,000 imp gal; 8,500 US gal) 2′2′ T 34: 34.0 m3 (1,200 cu ft) or 34,000 litres (7,500 imp gal; 9,000 US gal) 2′2′ T 30: 30 m3 (1,100 cu ft) or 30,000 litres (6,600 imp gal; 7,900 US gal) Boiler: ​ No. of heating tubes 112 No. of smoke tubes 36 Heating tube length 5,700 mm (18 ft 8+1⁄2 in) Boiler pressure 16 bar (1.60 MPa; 232 psi) Heating surface:  • Tubes 185 m2 (1,990 sq ft)  • Firebox 4.23 m2 (45.5 sq ft)  • Radiative 21.3 m2 (229 sq ft)  • Evaporative 206.30 m2 (2,220.6 sq ft) Superheater: ​  • Heating area 83.80 m2 (902.0 sq ft) Cylinders Three Cylinder size 520 mm (20+1⁄2 in) Piston stroke 660 mm (26 in) Valve gear outside valve gear with Winterthur slide Train heating Steam
Performance figures Maximum speed 110 km/h (68 mph) Indicated power 1,690 PS (1,240 kW; 1,670 hp)
Career Numbers 22 001 – 22 085 Retired 1971

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.