We are planning a trip to the Black Forest over Christmas. We intend to use Freiburg as a base and do day trips from there via train. It looks like there are quite a few places that are close to each other that probably don't require a day each so I was wondering if they could be combined using a single train ticket. As an example, could we get a ticket to Haslach and get off the train and look around Gengenbach and get on a later train to Haslach? Or would we need to get seperate tickets for each?