There are 1 train company operating 2 routes - ICE43, RE17. The cheapest train costs $92 and is 3h 37min.
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There are 4 ways to travel from CGN to KSF. 1 flight, 4 buses, 2 trains and 1 by car are possible between the two areas. The by car from CGN to KSF is the cheapest. The by car from CGN to KSF is the fastest. The train operated by running from Porz-Wahn to Grebenstein is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!