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While not a metro, Karlsruhe's tram and light rail map underwent several changes over the last 10 years, going from angular lines in 2008 over slighty rounded corners to a full curvy design introduced last year.
By 2010, the stations became circles, around 2013 they shortly experimented with showing express stops with a blue dot inside the station. while black dots as stops with limited service survived a bit longer.
Construction-wise, two lines to Germersheim were electrified and sorted as light (S51/S52) and commuter (S33) rail. A new tram line (6) in the south-east Karlsruhe was opened.
And for the construction of the underground tram (might open 2019-ish), each of the three north-south lines was affected for a while, which moved a few lines around each time. Not shown is the closure of parts of the east-west line during half of 2013 and countless short-time detours over a weekend or during vacations, each of which had their own map made though, but those would be too much to put into one webm.
For next year the biggest change will be renaming all the southern lines to S7/S8, the map for which was just published today.
