The Württemberg AD was a German

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, Fuel oil, oil or, rarely, Wood fuel, wood) to heat ...

built for the

Royal Württemberg State Railways The Royal Württemberg State Railways (''Königlich Württembergische Staats-Eisenbahnen'' or ''K.W.St.E.'') were the state railways of the Kingdom of Württemberg (from 1918 the ''People's State of Württemberg'') between 1843 and 1920. Early ...

. It was an express train engine with a

4-4-0 4-4-0, in the Whyte notation, denotes a steam locomotive with a wheel arrangement of four leading wheels on two axles (usually in a leading bogie), four powered and coupled driving wheels on two axles, and no trailing wheels. First built in the ...

wheel arrangement and was built from 1899 by the

Maschinenfabrik Esslingen Maschinenfabrik Esslingen (ME) was a German engineering firm that manufactured locomotives, tramways, railway wagons, roll-blocks, technical equipment for the railways, (turntable (rail), turntables and traverser (railway), traversers), bridges, s ...

('Esslingen Engineering Works'). Up to that point the railway only had increasingly elderly locomotives with a

2-4-0 Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles and no trailing wheels. In most of North America it b ...

configuration. The vehicles were equipped with a two-

cylinder A cylinder () has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infinite ...

compound engine A compound engine is an engine that has more than one stage for recovering energy from the same working fluid, with the exhaust from the first stage passing through the second stage, and in some cases then on to another subsequent stage or even s ...

. The most striking feature was the large, horizontal pipe connecting the two

steam dome The steam dome is a vessel fitted to the top of the boiler of a steam engine. It contains the opening to the main steam pipe and its purpose is to allow this opening to be kept well above the water level in the boiler. This arrangement acts as a ...

s. 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 A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, in some steam engines, and in processes such as steam reforming. ...

steam engines. This reduced the

boiler A boiler is a closed vessel in which fluid (generally water) is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, including water heating, centra ...

overpressure Overpressure (or blast overpressure) is the pressure caused by a shock wave over and above normal atmospheric pressure. The shock wave may be caused by sonic boom or by explosion An explosion is a rapid expansion in volume of a given amoun ...

to 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 The ''Deutsche Reichsbahn'' (), also known as the German National Railway, the German State Railway, German Reich Railway, and the German Imperial Railway, was the Weimar Republic, German national Rail transport, railway system created after th ...

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.

References

* * * {{DEFAULTSORT:Wurttemberg Ad 4-4-0 locomotives 2′B n2 locomotives AD Esslingen locomotives Railway locomotives introduced in 1899 Standard-gauge locomotives of Germany Passenger locomotives

See also

References