Also @TimmermansEU - if you want this to happen, ALL rail firms have to allow third parties to sell tickets (as Kayak can sell a Lufthansa flight). And then rail passengers need a “hop on next train” guarantee if a connection is missed. Demanding through tickets won’t work.
Just run this through a translation:
The devil here is going to be in the detail of course (does @CER_railways play along?), but that @TimmermansEU is going further than @AdinaValean is significant