Features of the model include SIFA, PZB and LZB in-cab signalling and driver safety devices, in-cab indicators, cab controls and cab lighting.
Over subsequent years, more sections of the route were independently built to service local industries in and around the towns of Weilheim, Tutzing, Murnau and Partenkirchen; these sections were upgraded and merged in the early 1900s, and on 20 February 1925, an electric hauled train completed the first full run from Munich Main Station to Garmisch-Partenkirchen.Built by a consortium of Siemens, Bombardier and DWA, the BR 426 is almost identical to the BR 425, bar the BR 426 being a two-car unit rather than a four-car unit. The Regionalbahn BR 426 is a popular train-set on the S6 Line, a train-set that is included with this route.