Prussian T 20

Prussian T 20
DRG Class 95
DR Class 95.0/1
Number(s) DRG 95 001–045
Quantity 45
Manufacturer Borsig, Hanomag
Year(s) of manufacture 1922–1924
Retired 1978
Axle arrangement 1′E1′ h2t
Type Gt 57.19
Track gauge 1,435 mm (4 ft 8 1⁄2 in)
Length over buffers 15,100 mm (49 ft 6 1⁄2 in)
Height 4,550 mm (14 ft 11 1⁄8 in)
Overall wheelbase 11,900 mm (39 ft 1⁄2 in)
Empty weight 103.7 t (102.1 long tons; 114.3 short tons)
Service weight 127.4 t (125.4 long tons; 140.4 short tons)
Adhesive weight 95.3 t (93.8 long tons; 105.1 short tons)
Axle load 19.1 t (18.8 long tons; 21.1 short tons)
Top speed 70 km/h (43 mph)
Indicated Power 1,192 kW (1,598 hp)
Driving wheel diameter 1,400 mm (4 ft 7 1⁄8 in)
Leading wheel diameter 850 mm (2 ft 9 1⁄2 in)
Trailing wheel diameter 850 mm (2 ft 9 1⁄2 in)
No. of cylinders 2
Cylinder bore 700 mm (27 9⁄16 in)
Piston stroke 660 mm (26 in)
Boiler Overpressure 14 bar (1,400 kPa; 200 psi)
Grate area 4.36 m2 (46.9 sq ft)
Superheater area 62.50 m2 (672.7 sq ft)
Evaporative heating area 200.00 m2 (2,152.8 sq ft)
Water capacity 12.0 m3 (420 cu ft)
or 12,000 L (2,640 imp gal; 3,170 US gal)
Fuel 4 t (3.9 long tons; 4.4 short tons) coal
Brakes Knorr compressed-air brake
Riggenbach counter-pressure brake

The German DRG Class 95 was a ten-coupled tank locomotive with a 2-10-2 wheel arrangement, which was procured by the Deutsche Reichsbahn (also referred to later as the Deutsche Reichsbahn-Gesellschaft or DRG) in 1922 for hauling heavy goods trains on steep main lines. Because the development of this class was begun by the Prussian state railways, it was designated as the Prussian Class T 20.

History

The first ten locomotives, built in 1922, were ordered as T 20 Magdeburg 9201–9210 and, because they were at first intended to be grouped into Class 77, were supplied as numbers 77 001 to 77 010. By 1923 they had been renumbered to 95 001–010. A total of 45 locomotives were built by 1924. Their areas of operations included the Sonneberg–Probstzella line, the Spessart ramp, the Franconian Forest Railway, the Geislingen ramp (Geislinger Steige), the Schiefe Ebene and the Rübeland Railway, where they earned their nickname Bergkönigin ('mountain queen').

The locomotives were the most powerful tank engines procured by the DRG. They could haul a train load of 2,060 tonnes (2,030 long tons; 2,270 short tons) at a speed of 50 km/h (31 mph) on the flat and could still manage 430 tonnes (420 long tons; 470 short tons) at 25 km/h (16 mph) on a 25‰ (2.5%) incline. The very high traction load of 95.3 tonnes (93.8 long tons; 105.1 short tons) enabled it to cope with inclines of up to 70‰ (7%) without needing a rack and its Riggenbach counter-pressure brake ensured that it could brake even heavy loads on a downhill stretch.

Of the 45 examples owned by the Reichsbahn, the Deutsche Bundesbahn took over 14 that, towards the end, were stationed in Aschaffenburg and used as pusher locomotives on the Spessart ramp. They were retired in 1958. Locomotives had also been stabled in Neuenmarkt-Wirsberg until 1952 for duties on the Schiefe Ebene.

31 locomotives ended up in the East German Deutsche Reichsbahn. Of these, 24 were rebuilt to oil-firing between 1971 and 1973 and ten were given a newly designed boiler. From 1970 the oil-fired engines were designated as DR Class 95.0 and the unconverted ones as DR Class 95.1. The last locomotives worked the line from Sonneberg to Eisfeld and were retired in 1981.

Preserved Locomotives

The following locomotives have been preserved:

At present only 95 027 is operational.

See also

Sources

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