Oldenburg B DRG Class 99.02
Numbering:	Nr. 3 DRG 99 021	Nr. 4–5 DRG 99 022–023
Quantity:	1	2
Manufacturer:	Freudenstein & Co	Hanomag Hanomag Hanomag was a German producer of steam locomotives, tractors, trucks and military vehicles. Hanomag first achieved international fame by delivering a large number of steam locomotives to Romania and Bulgaria before World War I....
Years of manufacture:	1904	1910, 1913
Retirement:	1945 ?	1945 ?, 1957
Wheel arrangement Whyte notation The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early twentieth century encouraged by an editorial in American Engineer and Railroad Journal... :	0-4-0T
Axle arrangement UIC classification The UIC classification of locomotive axle arrangements describes the wheel arrangement of locomotives, multiple units and trams. It is set out in the International Union of Railways "Leaflet 650 - Standard designation of axle arrangement on locomotives and multiple-unit sets". It is used in much... :	B n2t
Type:	K 22.5	K 22.6
Rail gauge Rail gauge Track gauge or rail gauge is the distance between the inner sides of the heads of the two load bearing rails that make up a single railway line. Sixty percent of the world's railways use a standard gauge of . Wider gauges are called broad gauge; smaller gauges, narrow gauge. Break-of-gauge refers... :	1,000 mm
Length over buffers Buffer (rail transport) A buffer is a part of the buffers-and-chain coupling system used on the railway systems of many countries, among them most of those in Europe, for attaching railway vehicles to one another.... :	4,958 mm	5,350 mm
Height:	3,007 mm	3,015 mm
Axle load Axle load The axle load of a wheeled vehicle is the total weight felt by the roadway for all wheels connected to a given axle. Viewed another way, it is the fraction of total vehicle weight resting on a given axle... :	5.6 t
Total wheelbase Wheelbase In both road and rail vehicles, the wheelbase is the distance between the centers of the front and rear wheels.- Road :In automobiles, the wheelbase is the horizontal distance between the center of the front wheel and the center of the rear wheel... :	1,300 mm	1,400 mm
Empty weight:	9.4 t
Service weight:	11.2 t	12.2 t
Adhesive weight Adhesive weight Adhesive weight is the amount of a locomotive's weight that is applied to the driving wheels and so capable of delivering traction. The more weight applied to the driving wheels, the greater the locomotive's ability to haul a load. But if the weight on the driving wheels exceeds the axle load of... :	11.2 t	12.2 t
Top speed:	40 km/h	30 km/h
Indicated Power:		74 kW
Driving wheel Driving wheel On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons... iameter:	800 mm
Valve gear Valve gear The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle... :	Allan	Walschaerts (Heusinger)
No. of cylinders:	2
Cylinder bore:	185 mm	235 mm
Piston stroke:	300 mm	400 mm
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:...  overpressure Overpressure The term Overpressure is applied to a pressure difference, relative to a "normal" or "ambient" pressure, in various circumstances:* In engineering: the pressure difference over the wall thickness of a pressure vessel... :	12 bar
No. of heating tubes:		70
Grate area:	0.39 m²	0.45 m²
Evaporative heating area:	17.60 m²	21.10 m²
Water capacity:	1.2 m³	1.0 m³
Fuel capacity:	0.35 t coal
Locomotive brake:	Hand-operated screw brake

The steam locomotives of Oldenburg Class B of the Grand Duchy of Oldenburg State Railways

Grand Duchy of Oldenburg State Railways

The Grand Duchy of Oldenburg Railway was the railway company that was run as a state railway for the Grand Duchy of Oldenburg , part of the German Empire....

 were built in the early 1900s for working the metre gauge

Metre gauge

Metre gauge refers to narrow gauge railways and tramways with a track gauge of . In some African, American and Asian countries it is the main gauge. In Europe it has been used for local railways in France, Germany, and Belgium, most of which were closed down in mid 20th century. Only in Switzerland...

 network on the German island of Wangerooge

Wangerooge Island Railway

The single track Wangerooge Island Railway is an unelectrified narrow gauge railway with a rail gauge of 1,000 mm located on the East Frisian island of Wangerooge off the northwestern coast of Germany...

.

Initially one example was ordered in 1904 from Freudenstein & Co. in Berlin. This tank engine weighed only 9.4 t when empty and could carry 1.2 m³ of water and 0.35 tonnes of coal

Coal

Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure...

. It had a well tank and the coal bunkers were on the left and right hand side of 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:...

. The engine drove the second axle and the locomotive had the number 3.

In 1910 a somewhat heavier and larger locomotive was ordered from Hanomag

Hanomag

Hanomag was a German producer of steam locomotives, tractors, trucks and military vehicles. Hanomag first achieved international fame by delivering a large number of steam locomotives to Romania and Bulgaria before World War I....

. It weighed in at 12.2 tonnes (service weight). Because this engine acquitted itself well, in 1913 another one was ordered. These two locomotives were given numbers 4 and 5.
After the formation of the Reichsbahn

Deutsche Reichsbahn

Deutsche 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...

 the engines were taken over, classified as DRG Class 99.02 and given the numbers 99 021–023. In 1942 locomotives 99 021 and 99 022 had to be handed over for wartime duties at the Eastern front

Eastern Front (World War II)

The Eastern Front of World War II was a theatre of World War II between the European Axis powers and co-belligerent Finland against the Soviet Union, Poland, and some other Allies which encompassed Northern, Southern and Eastern Europe from 22 June 1941 to 9 May 1945...

 where they disappeared without trace.

Number 99 023 remained on Wangerooge

Wangerooge

Wangerooge is one of the 32 Frisian Islands in the North Sea located close to the coasts of the Netherlands, Germany and Denmark. It is also a municipality in the district of Friesland in Lower Saxony in Germany.Wangerooge is one of the East Frisian Islands...

 and underwent a minor rebuild. It was given larger water tanks, wooden window shutters and an electrically operated lantern. It was retired in 1957.

See also

• Grand Duchy of Oldenburg State Railways
  Grand Duchy of Oldenburg State Railways
  The Grand Duchy of Oldenburg Railway was the railway company that was run as a state railway for the Grand Duchy of Oldenburg , part of the German Empire....
  
  
• List of Oldenburg locomotives and railbuses
• Länderbahnen
  Länderbahnen
  The German term Länderbahnen generally refers to the state railways of the German Empire in the period from about 1840 to 1920 when they were merged into the Deutsche Reichsbahn after the First World War....
  
  

Source

• Malte Werning: Wangerooge: Die Inselbahn und ihre Geschichte. Lokrundschau Verlag, Gülzow 1999, ISBN 3-931647-09-9

External links

• There is a relevant English-language forum at Railways of Germany