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Dieter Ludwig (image left) died today at the age of 81.
Being the director of Karlsruhe's transit operators from 1976 to 2006, he started his work by expanding the urban tram network in the 70s/80s at a time when conventional trams were considered obsolete in most other places. In the 90s he managed to develop it into a large regional light rail system as tram-trains.