Württemberg AD

The Württemberg AD was a German steam locomotive built for the Royal Württemberg State Railways. It was an express train engine with a 4-4-0 wheel arrangement and was built from 1899 by the Maschinenfabrik Esslingen ('Esslingen Engineering Works'). Up to that point the railway only had increasingly elderly locomotives with a 2-4-0 configuration.

Württemberg AD/ADh
DRG Class 13.16/13.17
1506 at Tübingen in March 1905
Number(s)AD:
KWStE 451–500, 1501–1538
DRG 13 1601–1624
ADh:
KWStE 1541–1557
DRG 13 1701–1714
Quantity115
ManufacturerMaschinenfabrik Esslingen
Year(s) of manufacture1899–1909
Retired1932
Wheel arrangement4-4-0
Axle arrangement
  • AD: 2′B n2v
  • ADh: 2′B h2
Length over buffers15,427 mm (50 ft 7 14 in)
Service weight50.2 tonnes (49.4 long tons; 55.3 short tons)
Adhesive weight29.2 tonnes (28.7 long tons; 32.2 short tons)
Axle load14.6 tonnes (14.4 long tons; 16.1 short tons)
Top speed100 km/h (62 mph)
Driving wheel diameter1,800 mm (70 78 in)
Leading wheel diameter850 mm (33 12 in)
No. of cylindersTwo
Cylinder boreADh: 490 mm (19 516 in)
LP cylinder boreAD: 670 mm (26 38 in)
HP cylinder boreAD: 450 mm (17 1116 in)
Piston stroke560 mm (22 116 in)
Boiler Overpressure
  • AD: 14 kg/cm2 (1.37 MPa; 199 psi)
  • ADh: 12 kg/cm2 (1.18 MPa; 171 psi)
Grate area2.00 m2 (21.5 sq ft)
Evaporative heating area129.10 m2 (1,389.6 sq ft)
Tenderwü 2 T 10, wü 3 T 15.5
Water capacity10.0 or 15.5 m3 (2,200 or 3,400 imp gal; 2,600 or 4,100 US gal)

The vehicles were equipped with a two-cylinder, compound engine. The most striking feature was the large, horizontal pipe connecting the two steam domes. Ninety eight engines of this class were built by 1907; they initially had flat slide valves, but from 1903 piston valves were installed.

In 1907 two locomotives were tested with two-cylinder, superheated steam engines. This reduced the boiler overpressure to 12 kg/cm2 (1.18 MPa; 171 psi) and generated an improvement in performance of about 20%. As a result, 17 more locomotives were built to this configuration up to 1909 and were designated as Class ADh.

Both classes began to be retired in the early 1920s.

The Deutsche Reichsbahn took over 24 of the compound locomotives as DRG Class 13.16 with numbers 13 1601 to 13 1624, and 14 superheated locomotives as DRG Class 13.17 with numbers 13 1701 to 13 1714. The first ones were retired in 1928, the last in 1932.

The locomotives were equipped with Württemberg wü 2 T 10 and wü 3 T 15,5 tenders.

See also

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