With all of the recommendations for the Bahn, I've been working on researching routes, times, costs, etc. and have a few questions. If we purchase a D-Ticket, I understand that it is good for all regional trains and buses...correct? So a train that starts with RE or S or maybe SWE (or is that a French train?) is included? Then if we have the D-Ticket, do we just get on whatever of those trains works for our schedule...no additional ticket needed...just decide on the time that we want to go and get on and we would just show that ticket when they check for tickets and we're good to go?
Another question...If our route has some IC or ICE train combined with a regional train do we purchase the IC/ICE portion of the route and use the D-Ticket for the regional train portion? Is this a risky venture to not purchase it to include the entire route or is it the right thing to do?