The Bavarian A II engines were early German

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 ...

steam locomotives 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, oil or, rarely, wood) to heat water in the locomot ...

with the

Royal Bavarian State Railways The Royal Bavarian State Railways (''Königliche Bayerische Staats-Eisenbahnen'' or ''K.Bay.Sts.B.'') was the state railway company for the Kingdom of Bavaria. It was founded in 1844. The organisation grew into the second largest of the German ...

(''Königlich Bayerische Staatsbahn''). The locomotives were conceived as Stephenson Long Boiler engines. They had an inside forked

frame A frame is often a structural system that supports other components of a physical construction and/or steel frame that limits the construction's extent. Frame and FRAME may also refer to: Physical objects In building construction *Framing (con ...

and the

firebox Firebox may refer to: *Firebox (steam engine), the area where the fuel is burned in a steam engine *Firebox (architecture), the part of a fireplace where fuel is combusted *Firebox Records, a Finnish 8101705801record label * Firebox.com, an electro ...

was supported by the

trailing axle On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle ( wheelset) located behind the driving wheels. The axle of the trailing wheels is usually located in a trailing truck. On some large locomotive ...

. The only difference between the engines from the two manufacturers was the location of the

feed pump A boiler feedwater pump is a specific type of pump used to pump feedwater into a steam boiler. The water may be freshly supplied or returning condensate produced as a result of the condensation of the steam produced by the boiler. These pumps are ...

. On the

Kessler Kessler or Keßler (in German) may refer to: * Kessler (automobile), an American automobile made 1921–1922 * Kessler (name), people named Kessler * ''Kessler'' (TV series), a British television series from 1981 * Kessler, Ohio, an unincorporat ...

variant this was on the outside and driven by crank pins; on the Maffei version they were suspended from the reverse eccentric cam (''Rückwärtsexzenter''). After it was discovered that the riding qualities of the loco were very rough, the trailing axle was moved about further back. In the 1860s the old

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, central h ...

on some vehicles was replaced by a Crampton boiler. In addition, six engines were rebuilt with a

wheel arrangement In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...

0-6-0 Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles and no trailing wheels. This was the most common wheel arrangemen ...

and three into

0-4-2 Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement with no leading wheels, four powered and coupled driving wheels on two axles and two trailing wheels on one axle. While the first locomotiv ...

locomotives. The remainder were taken out of service between 1871 and 1877 and scrapped. They were coupled with 2 T 4.2 tenders.

See also