Bavarian B IVs were early German 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 six engines built by Kessler

Emil Kessler

Emil Julius Carl Kessler was a German businessman and founder of the Maschinenfabrik Esslingen ....

 were trialled with a Kessler 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:...

. This had a pear-shaped cross section and could therefore be set lower down between the wheels. The same effect was also attempted on the machines from Hartmann by using two boilers: a lower boiler with a small diameter and a larger, upper boiler. After two boiler explosions occurred, all the engines were equipped with normal boilers. All the vehicles had a steam dome

Steam dome

A Steam dome is a vessel fitted to the top of the boiler of a steam locomotive. 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...

 in the centre, and the overhanging outer firebox had a flat top on which there was a safety valve

Safety valve

A safety valve is a valve mechanism for the automatic release of a substance from a boiler, pressure vessel, or other system when the pressure or temperature exceeds preset limits....

 and a pump (Fahrpumpe) driven by the crossheads.

They had Bavarian 3 T 5 tenders.

External links

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