Württemberg AD

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Württemberg AD/ADh
DRG Class 13.16/13.17
Number(s) AD:
KWStE 451–500, 1501–1538
DRG 13 1601–1624
KWStE 1541–1557
DRG 13 1701–1714
Quantity 115
Manufacturer Maschinenfabrik Esslingen
Year(s) of manufacture 1899–1909
Retired 1932
Wheel arrangement 4-4-0
Axle arrangement 2’B n2v/h2
Length over buffers 15,427 mm (50 ft 7.4 in)
Service weight 50.2 t
Adhesive weight 29.2 t
Axle load 14.6 t
Top speed 100 km/h (62 mph)
Driving wheel diameter 1,800 mm (70.87 in)
Leading wheel diameter 850 mm (33.46 in)
No. of cylinders Two
Cylinder bore ADh: 490 mm (19.29 in)
LP cylinder bore AD: 670 mm (26.38 in)
HP cylinder bore AD: 450 mm (17.72 in)
Piston stroke 560 mm (22.05 in)
Boiler Overpressure AD: 14 bar
ADh: 12 bar
Grate area 2.00 m2
Evaporative heating area 129.10 m2
Tender wü 2 T 10, wü 3 T 15.5
Water capacity 10.0/15.5 m3

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.

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 117.7 N/cm2 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[edit]