Bavarian A IV
Encyclopedia
Bavarian A IV engines were German 2-2-2
steam locomotives with the Royal Bavarian State Railways
(Königlich Bayerische Staatsbahn).
The vehicles were developed for night journeys and operations on the North-South Railway
. In order to increase the area of the evaporator
, the boiler
was increased in length to 3,080 mm and in diameter to 1,219 mm. In addition, the weight and the boiler
overpressure
were raised. These were the first engines to have an outside frame
with outside cylinders. This class was used widely, especially in south Germany and in Austria
. All the engines bar one were retired by 1883. The survivor was initially converted to a 0-6-0
, and later a 0-4-2
wheel arrangement
.
They were coupled to 3 T 5 tenders
.
2-2-2
Under the Whyte notation for the classification of steam locomotives, 2-2-2 represents the wheel arrangement of two leading wheels on one axle two powered driving wheels on one axle, and two trailing wheels on one axle. The wheel arrangement both provided more stability and enabled a larger firebox...
steam locomotives with the Royal Bavarian State Railways
Royal Bavarian State Railways
As a nation-state, Germany did not come into being until the creation of the German Empire in 1871 from the various German-speaking states such as Prussia, Bavaria, Saxony, Baden and Württemberg. By then each of the major states had formed its own state railway and these continued to remain...
(Königlich Bayerische Staatsbahn).
The vehicles were developed for night journeys and operations on the North-South Railway
Ludwig South-North Railway
The Ludwig South-North railway , built between 1843 and 1854, was the first railway line to be constructed by Royal Bavarian State Railways...
. In order to increase the area of the evaporator
Evaporator
An evaporator is a device used to turn the liquid form of some chemical into its gaseous form. For example, an evaporator is used in an air conditioning system to allow the compressed cooling chemical to evaporate from liquid to gas, absorbing heat in the process.-Uses:As stated above, an...
, 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:...
was increased in length to 3,080 mm and in diameter to 1,219 mm. In addition, the weight and 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:...
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...
were raised. These were the first engines to have an outside 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...
with outside cylinders. This class was used widely, especially in south Germany and in Austria
Austria
Austria , officially the Republic of Austria , is a landlocked country of roughly 8.4 million people in Central Europe. It is bordered by the Czech Republic and Germany to the north, Slovakia and Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the...
. All the engines bar one were retired by 1883. The survivor was initially converted to a 0-6-0
0-6-0
Under the Whyte notation for the classification of steam locomotives, 0-6-0 represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles, and no trailing wheels...
, and later a 0-4-2
0-4-2
Under the Whyte notation for the classification of steam locomotives, 0-4-2 represents the wheel arrangement with no leading wheels, four powered and coupled driving wheels on two axles, and two trailing wheels on one axle...
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...
.
They were coupled to 3 T 5 tenders
Tender locomotive
A tender or coal-car is a special rail vehicle hauled by a steam locomotive containing the locomotive's fuel and water. Steam locomotives consume large quantities of water compared to the quantity of fuel, so tenders are necessary to keep the locomotive running over long distances. A locomotive...
.
External links
- There is a relevant English-language forum at Railways of Germany