Württemberg T 4

The Württemberg T 4 was a class of German, eight-coupled, goods train, tank locomotive operated by the Royal Württemberg State Railways.

Württemberg T 4
DRG Class 92.1
T4 No. 852 works photo, 1906
Number(s)Nr. 851–858
DRG 92 101–92 108
Quantity8
ManufacturerMaschinenfabrik Esslingen
Year(s) of manufacture1906 and 1909
Retiredby 1948
Wheel arrangement0-8-0T
Axle arrangementD n2t
TypeGt 44.16
Track gauge1,435 mm (4 ft 8 12 in)
Length over buffers11,000 mm (36 ft 1 in)
Height4,650 mm (15 ft 3 in)
Wheelbase4,650 mm (15 ft 3 in)
Overall wheelbase4,650 mm (15 ft 3 in)
Empty weight49.80 tonnes (49.01 long tons; 54.90 short tons)
Service weight64.50 tonnes (63.48 long tons; 71.10 short tons)
Adhesive weight64.50 tonnes (63.48 long tons; 71.10 short tons)
Axle load16.10 tonnes (15.85 long tons; 17.75 short tons)
Top speed52 km/h (32 mph)
Driving wheel diameter1,380 mm (4 ft 6 38 in)
Valve gearWalschaerts (Heusinger)
No. of cylinders2
Cylinder bore530 mm (20 78 in)
Piston stroke612 mm (24 18 in)
Boiler Overpressure14.0 kg/cm2 (1.37 MPa; 199 psi)
No. of heating tubes266
Heating tube length4,000 mm (13 ft 1 12 in)
Grate area2.08 m2 (22.4 sq ft)
Radiative heating area9.70 m2 (104.4 sq ft)
Tube heating area133.70 m2 (1,439.1 sq ft)
Evaporative heating area143.40 m2 (1,543.5 sq ft)
Water capacity6.00 m3
Fuel1.50 t coal
Locomotive brakesScrew brake, counterpressure brake

When the T 3 locomotives were no longer capable of banking services on the Geislinger Steige, a locomotive was designed that was to develop twice the power. Because no more locomotives were needed for duties on the ramps, only eight were produced, of which five were supplied in 1906 and three in 1909. In their day they were the heaviest eight-coupled locomotives in Germany.

In designing the boiler, special emphasis had been laid on a large steam space and a low-lying firebox crown so that banking could be achieved with refilling with water, which led to a reduction in boiler pressure and a resultant drop in performance.

In order to reduce wear and tear on the tyres and brake shoes during descents, the engines were fitted with Riggenbach counter-pressure brakes.

In 1925 the Deutsche Reichsbahn took over all eight locomotives and grouped them into DRG Class 92.1 in their numbering plan. After the Second World War they ended up in the Deutsche Bundesbahn, where they were retired between 1946 and 1948 or sold as industrial locomotives.

See also

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