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Kieler Woche begins tomorrow and on the weekend days there will be through museum train services between Kiel Hbf and Schönberg on the line thats planned to be reopened for regular commuter traffic in late 2025.
Sadly I will not be in Kiel before July but if anyone is anywhere near, go there and enjoy the ride.
I remember historic trains also running between Kiel and Eckernförde/Flensburg but that line is closed for the replacement of one of the most unique bridges in Germany (picrel)