The Bavarian A II engines were early German 2-2-2 steam locomotives with the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn). The locomotives were conceived as Stephenson Long Boiler engines. They had an inside forked frame and the firebox was supported by the trailing axle. The only difference between the engines from the two manufacturers was the location of the feed pump. On the Kessler variant this was on the outside and driven by crank pins; on the Maffei version they were suspended from the reverse eccentric cam (Rückwärtsexzenter). They were coupled with 2 T 4.2 tenders.