Bavarian D VI

The Bavarian Class D VI were German, 0-4-0, steam locomotives of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn). They were light, twin-coupled, saturated steam, tank engines. Maffei supplied the first 30 locomotives from 1880 to 1883, and Krauss delivered a further 23 up to 1894.

Bavarian D VI DRG Class 98.75
No. 83 BERG on 5 October 1985 in Bochum-Dahlhausen
Number(s)	K.Bay.Sts.E.: 38…974, 1801–1804 DRG: 98 7501 – 98 7526
Quantity	53
Manufacturer	Maffei (30) Krauss (23)
Year(s) of manufacture	1880–1894
Retired	1964
Wheel arrangement	0-4-0T
Axle arrangement	B n2t
Type	L 22.9
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)
Length over buffers	6,860 or 6,910 mm (22 ft 6 in or 22 ft 8 in)
Service weight	18.5 or 19.6 t (18.2 or 19.3 long tons; 20.4 or 21.6 short tons)
Adhesive weight	18.5 or 19.6 t (18.2 or 19.3 long tons; 20.4 or 21.6 short tons)
Axle load	9.3 or 9.8 t (9.2 or 9.6 long tons; 10.3 or 10.8 short tons)
Top speed	45 km/h (28 mph)
Driving wheel diameter	1,006 mm (3 ft 3 ^5⁄8 in)
No. of cylinders	2
Cylinder bore	266 mm (10 ^1⁄2 in)
Piston stroke	508 mm (20 in)
Boiler Overpressure	12 kgf/cm^2 (1,180 kPa; 171 lbf/in^2)
Grate area	0.75 m^2 (8.1 sq ft)
Evaporative heating area	25.71 or 28.50 m^2 (276.7 or 306.8 sq ft)
Water capacity	1.8 or 2.3 m^3 (400 or 510 imp gal; 480 or 610 US gal)
Fuel	500 or 800 kg (1,100 or 1,800 lb) coal
Locomotive brakes	Hardy vacuum brakes, some with compressed-air brakes

History

The Class D VI locomotives were procured for branch lines in flat terrain and had a maximum permitted axle load of 12 tons.

The first 44 locomotives had no side tanks. Water was stored in a well tank, and coal in the driver's cab. The last nine locomotives, on the other hand, had short tanks on either side, in front of the driver's cab. That increased water capacity from 1.8 to 2.3 m² and coal capacity from 0.5 to 0.8 t.

In the 1920s, several D VI's were on duty in the Palatinate (Pfalz) as pontoon locomotives at Speyer and Maximiliansau.

In 1925 the Deutsche Reichsbahn-Gesellschaft took over 26 vehicles as DRG Class 98.75 (Baureihe 98.75), five of which had side tanks. They were retired by the end of the 1920s and some were sold on as industrial locomotives.

The final duties of former locomotive number 83, Berg (98 7508), delivered by Krauss in 1883, were in a peat factory in Raubling, where it was not taken out of service until 1964. This locomotive is the only surviving example of its class and is in the care of the German Railway History Company (Deutsche Gesellschaft für Eisenbahngeschichte e. V. or DGEG).

Technical features

The Class D VI was manufactured with a riveted plate frame that also acted as the water tank.

The boiler was a riveted two-piece construction; the firebox, with its square cross-section, was arranged between the sole bars. Two injectors fed the boiler.

The outside, twin-cylinder, saturated steam engine was furnished with a Stephenson valve gear; the second axle was the driving axle.

For the first time on Bavarian locomotives, running plates and Hardy vacuum brakes were installed on these saturated-steam engines. Several examples had gangways as well. An unusual feature was the location of the sandbox under the running plate between the coupled axles. They had slide valves on top and outside Stephenson link motion.[1]

See also

• Royal Bavarian State Railways
• List of Bavarian locomotives and railbuses

References

1. Ransome-Wallis, P (1971). Preserved Steam Locomotives of Western Europe, Volume One. Ian Allan Ltd. ISBN 0-7110-0196-0., p. 279

• Weisbrod, Manfred; Müller, Hans; Petznick, Wolfgang (1994). Deutsches Lok-Archiv: Dampflokomotiven 3 (Baureihen 61 – 98) (4th ed.). Berlin: transpress. pp. 309 ff. and 364. ISBN 3-344-70841-4.