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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.

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Württemberg AD/ADh DRG Class 13.16/13.17
1506 at Tübingen in March 1905
Type and origin Builder Maschinenfabrik Esslingen Build date 1899–1909 Total produced 115
Specifications Configuration: ​  • Whyte 4-4-0 Leading dia. 850 mm (33+1⁄2 in) Driver dia. 1,800 mm (70+7⁄8 in) Length: ​  • Over beams 15,427 mm (50 ft 7+1⁄4 in) Axle load 14.6 tonnes (14.4 long tons; 16.1 short tons) Adhesive weight 29.2 tonnes (28.7 long tons; 32.2 short tons) Service weight 50.2 tonnes (49.4 long tons; 55.3 short tons) Water cap. 10.0 or 15.5 m3 (2,200 or 3,400 imp gal; 2,600 or 4,100 US gal) Boiler pressure AD: 14 kg/cm2 (1.37 MPa; 199 psi) ADh: 12 kg/cm2 (1.18 MPa; 171 psi) Heating surface:  • Firebox 2.00 m2 (21.5 sq ft)  • Evaporative 129.10 m2 (1,389.6 sq ft) Cylinders Two Cylinder size ADh: 490 mm (19+5⁄16 in) Piston stroke 560 mm (22+1⁄16 in) High-pressure cylinder AD: 450 mm (17+11⁄16 in) Low-pressure cylinder AD: 670 mm (26+3⁄8 in)
Performance figures Maximum speed 100 km/h (62 mph)
Career Numbers AD: KWStE 451–500, 1501–1538 DRG 13 1601–1624 ADh: KWStE 1541–1557 DRG 13 1701–1714 Retired 1932

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

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

References

• Weisbrod, Manfred; Müller, Hans; Petznik, Wolfgang (1976). Dampflokomotiven deutscher Eisenbahnen, Baureihe 01–39 (EFA 1.1) (in German) (3rd ed.). Düsseldorf: Alba Buchverlag. pp. 87–89. ISBN 3-87094-081-6.

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