Saxon IIIb V

IIIb V
DR Class 34.79
Number(s) 501–518
DR 34 7901–7902
Quantity 18
Manufacturer Sächsische Maschinenfabrik, Chemnitz
Year(s) of manufacture 1889/1892
Retired 1923
Axle arrangement 1' B n2v
Gauge 1,435 mm (4 ft 8 1⁄2 in)
Length over buffers 13,996 mm (45 ft 11.0 in)
Height 4,150 mm (13 ft 7 in)
Overall wheelbase 4,550 mm (14 ft 11 in) / 4,950 mm (16 ft 3 in)
Empty weight 37.2 t
Service weight 41.0 t
Adhesive weight 27.8 t
Axle load 13.9 t
Top speed 75 km/h (47 mph)
Driving wheel diameter 1,560 mm (5 ft 1 in)
Carrying wheel diameter 1,230 mm (4 ft 0 in)
Valve gear Allan
No. of cylinders 2
LP cylinder bore 420 mm (17 in)
HP cylinder bore 650 mm (26 in)
Piston stroke 560 mm (22 in)
Boiler Overpressure 12 bar
No. of heating tubes 180
Heating tube length 3,500 mm (11 ft 6 in)
Grate area 1.82 m2 (19.6 sq ft)
Radiative heating area 8.0 m2 (86 sq ft)
Tube heating area 89.0 m2 (958 sq ft)
Evaporative heating area 97.02 m2 (1,044.3 sq ft)
Tender sä 3T 9
Brakes Schleifer air brakes
Westinghouse air brakes (refit)

The Saxon Class IIIb was a twin-coupled tender locomotive built for passenger services with the Royal Saxon State Railways.

History

Following the success with the compound locomotives of Class VIb V, corresponding locomotives were procured for hauling passenger trains. Based on the design of the Saxon IIIb the Saxon Engineering Works (Sächsische Maschinenfabrik) built a compound engine. In the years 1889 and 1892 a total of 18 units of the IIIb V were built for passenger train duties. Because the engines apparently did not prove themselves, no further orders were placed.

In 1920, the Deutsche Reichsbahn took over some of the locomotives, but only two remaining engines were included in the new numbering scheme in 1924: numbers 34 7901 and 34 7902.

Design features

The locomotives had a boiler made from three shell rings with a semi-circular cover which, in the area of the firebox, was tucked in it between the frame plates. The boiler was fed by two non-sucking injectors.

The steam engine was designed as a twin-cylinder compound engine with interior Allan valve gear. The high-pressure cylinder was placed on the right, the larger, low-pressure cylinder on the left. They drove the second coupled axle.

The driving axles were fixed in the frame, the leading carrying wheels were designed as a Novotny-Klien axle.

The locomotives left the factory equipped with Schleifer compressed air brakes; these only braked the engine, however. Later, all the locomotives were fitted with Westinghouse air brakes. The locomotiven were coupled to tenders of Saxon Class sä 3 T 9.

Literature

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