Treat preorder as an attempt, not a ticket. Watch confirmation status, prepare alternate trains, and do not plan nonrefundable connections until the ticket is issued.
Do not assume payment authorization means ticket issued.
Do not ignore alternate train windows.
Traveler experience
Watch and read real traveler context
These videos and Reddit threads are related to this guide's scenario. Use them
as practical context, not as a guarantee that the same steps will work for every
card, device, passport, hotel, route, or merchant.