Originally Posted by
Creole Spirit
..but it's almost the same vice versa
If passenger is holding a Rail&Fly-ticket (or "Fly&Rail-ticket if the travel starts abroad, issued on a Thai Airways ticket document, he can take any train to/from Frankfurt/Munich airport and as such can travel almost "hassle-free" (you just may want to buy a new seat reservation ticket at Frankfurt Airport Railways station as seat reservations are not included in Rail&Fly-tickets, regardless if First or Coach Class).
Any other railways tickets are under your own responsibility.
That's very different, though a positive for the OP. To the airport the text was the the traveller has full responsibility to make it to check in or flight on time. Here you say that the OP can just take any train after arriving on a flight to Frankfurt or Munich. So kit really possible to miss the train connection, unless it is the last train of the day.
But that should generally, as said, be good news for the OP.