The trend of opening reservations before the plan is confirmed is
getting out of hand!
Better than the trend of not opening reservations till the last moment, leaving travelers wondering if they will be able to travel.
A few good things to know:
- The moment you have a train ticket from A to B you have a contract. The railways cannot step back from that contract at their own discretion. So if you have a ticket from Paris to Munich then they will have to transport you from Paris to Munich. Railways cannot on their own initiative cancel a ticket.
- If you get an email that says "your train has been cancelled, you can get a full refund" they are trying to trick you in to cancelling yourself, because then they are off the hook. When you get this message you should reply "Ok. How are uou going to get me to my destination".
And a good thing to be aware of is the IRT/NRT border.
In Latin Europe (France, Italy. Spain...) long distance trains use IRT, "Integrated Reservation Ticketing". That means that a ticket always comes with a reservation. That also means that you can only get a ticket once the seat inventory is loaded, which leads to sometimes short booking horizones, as people wanting to travel to Florence at the end of July are currently finding out.
It also means that if you miss a connection due to a delay you need to have your ticket exchaged for a new one.
Germanic countries have NRT tickets. "Non Reseved Tickets". So a ticket is for a route (even if it has train binding) and reservations are handled separately. That is why you can buy a ticket without a reservation, or a reservation without a ticket. And why it sometimes is possible to buy tickets for a route, but not (yet) reservations. So ticket inventory and seat inventory are handled separately. You can run in to a situation where you can eg. buy a discounted ticket Wien - Salzburg but not reserve a seat because the seat inventory is not loaded yet.
One interesting way this manifests itself in, is in what you get when you book a trip.
When you book at trip from somewhere in Switzeland to somewhere in eg The Netherlands, with a route via Germany you will get one single ticket for the whole route. Even if the route involves 6 different trains.
Whereas when you book a ticket in Italy from eg. Sienna to Venice with a change of train in Firenze you will get one ticket for Sienna - Firenze, and another one for Firenze - Venice.
This leads to some complicates whe crossing the IRT/NRT border, eg. as happens when traveling from Paris to Munich. From Paris to the German border you have an IRT ticket, with included reservation. SNCF normally does not open reservations unless they are very certain the train will run. But the German railways will sell tickets if they know that there will be trains but reserve the right to change schedules.
Note: When you buy a train ticket that always comes with small print somewhere that says that you must check the schedule yourself before you set out, to see if anything has changed. This is not air travel. Trains do not have passenger manifests. It is still possible to buy a train ticket using cash without telling anyone who you are, so railways cannot reliable know who is actually going to be on their trains, nor do they actually care. In my youth we bought train tickets to far away destinations without even knowing the schedule.
So if you get a message from DB or OBB that your train has changed, just look up your trip again with the same departure time you originally intendend, and travel according to what you find there. In NRT country your ticket is for a route, so you do not need to have it exchanged if you end up taking other trains than planned.