Württemberg Hz
Encyclopedia
The Württemberg Hz were 0-10-0
rack
and adhesion steam locomotives, that were initially developed by the Royal Württemberg State Railways
(Königlich Württembergische Staats-Eisenbahnen), but were delivered to the Deutsche Reichsbahn-Gesellschaft
(DRG) in the mid-1920s.
.
The cylinders of the adhesion and cogwheel drives have the same diameters (Ø 560 mm). The difference in volume (after expulsion from the adhesion system, the steam doubles its volume) is compensated for because the cogwheel drive turns twice as fast. The driving cogwheel is housed in a special frame, that lies above the second and third axle. The higher cogwheel drive and the lower cogwheel are coupled via an intermediate gear with a transmission ratio of 1:2.43.
The boiler
s were given steel fireboxes and the frame
was reinforced, especially in the area of the drive. The outermost axles, which had side play, were given return springs to minimise hunting.
. They were employed on the 1-in-10 Honau-Lichtenstein
rack railway, 2.2 km long, which employed a Riggenbach
-Klose
rack system. Apart from 97 503, which was destroyed during the Second World War, remained there until their retirement in 1961. Number 97 502 returned to its producer, the Maschinenfabrik Esslingen
(now owned by Daimler-Benz
) at Esslingen am Neckar
and was set up as a monument there, before being moved to Bochum-Dahlhausen Railway Museum.
From 1952 locomotives 97 502 and 504 were modernised in the Maschinenfabrik Esslingen in order to raise their running speed in both adhesion and cogwheel working.
To increase their radius of action numbers 97 501, 502 and 504, the coal tank capacity was increased by 1 tonne.
0-10-0
Under the Whyte notation for the classification of steam locomotives, 0-10-0 represents the wheel arrangement of no leading wheels, ten powered and coupled driving wheels on five axles, and no trailing wheels...
rack
Rack railway
A rack-and-pinion railway is a railway with a toothed rack rail, usually between the running rails. The trains are fitted with one or more cog wheels or pinions that mesh with this rack rail...
and adhesion steam locomotives, that were initially developed by the Royal Württemberg State Railways
Royal Württemberg State Railways
The Royal Württemberg State Railways were the state railways of the Kingdom of Württemberg between 1843 and 1920...
(Königlich Württembergische Staats-Eisenbahnen), but were delivered to the Deutsche Reichsbahn-Gesellschaft
Deutsche Reichsbahn-Gesellschaft
The Deutsche Reichsbahn – was the name of the German national railway created from the railways of the individual states of the German Empire following the end of World War I....
(DRG) in the mid-1920s.
Design
The locomotives had a Winterthur cogwheel drive with one lower and one upper pair of cylinders. On the level, they ran like normal steam locomotives using the lower, higher pressure, pair of cylinders driving on the third coupled axle. Before entering the rack section the upper drive was started using live steam. At the same time the r.p.m. was matched to the running speed so that entry into the rack section could be achieved smoothly. Once the cogwheel had engaged the rack, the exhaust from the lower cylinders was routed to the upper, lower pressure, ones using a change valve and was expelled from the chimney. The locomotive now worked as a compoundCompound locomotive
A compound engine unit is a type of steam engine where steam is expanded in two or more stages.A typical arrangement for a compound engine is that the steam is first expanded in a high-pressure cylinder, then having given up heat and losing pressure, it exhausts directly into one or more larger...
.
The cylinders of the adhesion and cogwheel drives have the same diameters (Ø 560 mm). The difference in volume (after expulsion from the adhesion system, the steam doubles its volume) is compensated for because the cogwheel drive turns twice as fast. The driving cogwheel is housed in a special frame, that lies above the second and third axle. The higher cogwheel drive and the lower cogwheel are coupled via an intermediate gear with a transmission ratio of 1:2.43.
The boiler
Boiler
A boiler is a closed vessel in which water or other fluid is heated. The heated or vaporized fluid exits the boiler for use in various processes or heating applications.-Materials:...
s were given steel fireboxes and the frame
Locomotive frame
A locomotive frame is the structure that forms the backbone of the railway locomotive, giving it strength and supporting the superstructure elements such as a cab, boiler or bodywork. The vast majority of locomotives have had a frame structure of some kind...
was reinforced, especially in the area of the drive. The outermost axles, which had side play, were given return springs to minimise hunting.
Operations
The DRG organised these tank locomotives into Class 97.5 in their numbering planDRG renumbering plan for steam locomotives
In 1922 the Deutsche Reichsbahn began to develop a renumbering plan to standardize the numbering of steam locomotives that had been taken over from the state railways . Its basis was the corresponding DRG classification system....
. They were employed on the 1-in-10 Honau-Lichtenstein
Lichtenstein (Reutlingen)
Lichtenstein is a municipality in the Tübingen administrative region in Baden-Württemberg, Germany. It lies at the foot of the Swabian Alb ....
rack railway, 2.2 km long, which employed a Riggenbach
Niklaus Riggenbach
Niklaus Riggenbach was the inventor of the Riggenbach rack system and the counter-pressure brake. He was also an engineer and locomotive builder....
-Klose
Adolf Klose
Adolf Klose was the chief engineer of the Royal Württemberg State Railways in southern Germany from June 1885 to 1896.Klose was born on 21 May 1844 in Bernstadt auf dem Eigen, in Saxony. Before his taking up his post in Stuttgart he had been the technical inspector of the United Swiss Railways...
rack system. Apart from 97 503, which was destroyed during the Second World War, remained there until their retirement in 1961. Number 97 502 returned to its producer, the Maschinenfabrik Esslingen
Maschinenfabrik Esslingen
Maschinenfabrik Esslingen , was a German engineering firm that manufactured locomotives, tramways, railway wagons, roll-blocks, technical equipment for the railways, , bridges, steel structures, pumps and boilers.-Founding:...
(now owned by Daimler-Benz
Daimler-Benz
Daimler-Benz AG was a German manufacturer of automobiles, motor vehicles, and internal combustion engines; founded in 1926. An Agreement of Mutual Interest - which was valid until year 2000 - was signed on 1 May 1924 between Karl Benz's Benz & Cie., and Daimler Motoren Gesellschaft, which had...
) at Esslingen am Neckar
Esslingen am Neckar
Esslingen am Neckar is a city in the Stuttgart Region of Baden-Württemberg in southern Germany, capital of the District of Esslingen as well as the largest city in the district....
and was set up as a monument there, before being moved to Bochum-Dahlhausen Railway Museum.
From 1952 locomotives 97 502 and 504 were modernised in the Maschinenfabrik Esslingen in order to raise their running speed in both adhesion and cogwheel working.
To increase their radius of action numbers 97 501, 502 and 504, the coal tank capacity was increased by 1 tonne.
Preserved
Of the four machines built, three have been preserved:- 97501 in ReutlingenReutlingenReutlingen is a city in Baden-Württemberg, Germany. It is the capital of the eponymous district of Reutlingen. As of April 2008, it has a population of 109,828....
(information at www.zhl.de) - 97502 at the Bochum-Dahlhausen Railway Museum in BochumBochumBochum is a city in North Rhine-Westphalia, western Germany. It is located in the Ruhr area and is surrounded by the cities of Essen, Gelsenkirchen, Herne, Castrop-Rauxel, Dortmund, Witten and Hattingen.-History:...
-Dahlhausen - 97504 at the Deutsches Technikmuseum Berlin
See also
- Royal Württemberg State RailwaysRoyal Württemberg State RailwaysThe Royal Württemberg State Railways were the state railways of the Kingdom of Württemberg between 1843 and 1920...
- Deutsche ReichsbahnDeutsche ReichsbahnDeutsche Reichsbahn was the name of the following two companies:* Deutsche Reichsbahn, the German Imperial Railways during the Weimar Republic, the Third Reich and the immediate aftermath...
- List of DRG locomotives and railbuses
- List of Württemberg locomotives and railbuses
External links
- There is a relevant English-language forum at Railways of Germany