You'll find details at bahn.de. Enter your planned trip and in the details section of any selected trip you'll find which track (Gleis) the train will be on. Then you can go to the station info and I saw a nice PDF with a map of Karlsruhe Hbf. I was looking at this in German, don't know if there is a possibility to have the site in English (Edit: at the top of the homepage you can select languages)
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