Saxon IIIb

Saxon IIIb
DRG Class 52.7
DRG Class 34.77–78
Manufacturers: Esslingen Schwartzkopf Hartmann Henschel
Quantity: 14
Rebuild from III		 32 157 15
Numbers: 274–287
52 7001 		288–319
34 7701–7702 		320–334
34 7721–7808		 335–491
Entered service: 1874 1873-1876 1874-1901 1876
Retired: by end of the 1920s
Wheel arrangement: 2-4-0
Axle arrangement: 1'Bn2
Service weight: 34.6 t 35.8 t
Axle load: 11.5 t
Adhesive weight: 23.1 t 23.8 t
Length over buffers: N/K 13,854 / 13,050 mm
Driving wheel diameter: 1,525 mm 1,560 mm
Carrying wheel diameter: 990 mm 1,035 mm
Top speed: 70 km/h 60 / 70 km/h
Boiler overpressure: 8.5 bar 10 bar
Piston stroke: 560 mm
Cylinder bore: 406 mm
Grate area: 1.55 m² 1.60 / 166 m²
Evaporative heating area: 90.80 m² 92.93 m²
Brakes: Countersteam brake
Westinghouse compressed-air brake

The Saxon Class III b were German steam locomotives built for the Royal Saxon State Railways (Königlich Sächsische Staatseisenbahnen) in the late 19th century as tender locomotives for express train duties. In 1925, the Deutsche Reichsbahn incorporated the engines into DRG Class 34.77-78.

Between 1873 and 1901, a total of 204 locomotives were delivered to the Royal Saxon State Railways by the firms of Hartmann, Henschel and Schwartzkopff. During the course of their manufacture there were continual modifications. Eighteen were built as compound engines.

The Reichsbahn took over 91 machines and gave them the running numbers 34 7701, 34 7702,
34 7721–34 7808.

Rebuild of the Saxon Class III

Later, 14 engines of the Saxon Class III were equipped with Nowotny steerable axles and also classified as Saxon IIIb locomotives. Of fourteen such engines, only one entered the Deutsche Reichsbahn where it was given the running number 52 7001.

The locomotives equipped with Saxon sä 3 T 7.5 und sä 3 T 9 tenders.

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