Me and my girlfriend have decided to take a long-weekend 9-Euro-Ticket trip from Nuremberg to Leipzig and all the searches only turn up the route RE42 Nuremberg-Leipzig, but there is no way to determine as to what the opposite route is called. Is this also called RE42? Why is there no interactive map of train lines that can be explored online? Google Maps is of no help since they show only the quickest routes instead, which are not covered by the 9-Euro-Ticket.
Can someone please give me some advice on how to search such things in the future? The [Bahn.de](https://Bahn.de) website is as useless as a wet sock in a carburetor.
Vielen Dank!