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
Type and origin Builder Maschinenfabrik Esslingen Build date 1906 and 1909 Total produced 8
Specifications Configuration: ​  • Whyte 0-8-0T  • UIC D n2t  • German Gt 44.16 Gauge 1,435 mm (4 ft 8+1⁄2 in) Driver dia. 1,380 mm (4 ft 6+3⁄8 in) Wheelbase:  • Overall 4,650 mm (15 ft 3 in) Length: ​  • Over beams 11,000 mm (36 ft 1 in) Height 4,650 mm (15 ft 3 in) Axle load 16.10 tonnes (15.85 long tons; 17.75 short tons) Adhesive weight 64.50 tonnes (63.48 long tons; 71.10 short tons) Empty weight 49.80 tonnes (49.01 long tons; 54.90 short tons) Service weight 64.50 tonnes (63.48 long tons; 71.10 short tons) Fuel capacity 1.50 t coal Water cap. 6.00 m3 Boiler: ​ No. of heating tubes 266 Heating tube length 4,000 mm (13 ft 1+1⁄2 in) Boiler pressure 14.0 kg/cm2 (1.37 MPa; 199 psi) Heating surface:  • Tubes 133.70 m2 (1,439.1 sq ft)  • Firebox 2.08 m2 (22.4 sq ft)  • Radiative 9.70 m2 (104.4 sq ft)  • Evaporative 143.40 m2 (1,543.5 sq ft) Cylinders 2 Cylinder size 530 mm (20+7⁄8 in) Piston stroke 612 mm (24+1⁄8 in) Valve gear Walschaerts (Heusinger) Loco brake Screw brake, counterpressure brake
Performance figures Maximum speed 52 km/h (32 mph)
Career Numbers Nr. 851–858 DRG 92 101–92 108 Retired by 1948

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.