The B IXs of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn), built from 1874, were the first express train locomotives in Bavaria. (N.B. The engines described here are not to be confused with the B IX steam engines built in 1870 and described under Bavarian B IX (1870).) At the Deutsches Museum in Munich a sectioned example has been preserved. Parts of the collection, including the B IX, are stored in the Freilassing Locomotive World (Lokwelt Freilassing) museum in Freilassing due to a shortage of space. The vehicles were coupled to Bavarian 3 T 10,5 tenders.