The BR 01 had been the first type of the Einheitslok-Progamm of the Deutsche Reichsbahn-Gesellschaft (DRG). Starting in 1925 the DRG ordered 231 locos. The 2 cylinder 01 reached a maximum speed of 120 (later 130 km/h). Both German Railways DB and DR needed the 01 after 2nd World War so the modernized 50 (DB) and 35 (DR) locos of BR 01 e.g. with new boilers. Nevertheless original 01 stayed in service until the early 1970s.
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