Seat reservations are one of the most misunderstood parts of European rail travel. On some trains they are compulsory — you cannot board without one. On others they are optional, and on many they do not exist at all. Getting this wrong means either turning up to a train you cannot board, or paying for reservations you did not need. Here is how to tell the difference.
The basic rule: compulsory, optional or not available
European trains fall into three categories when it comes to reservations:
- Compulsory reservation required. You must have a reserved seat (or berth) to board, regardless of whether you hold a point-to-point ticket or a rail pass. There is no open seating — every passenger occupies a specific numbered seat.
- Reservations optional. You may reserve a seat if you want the certainty of a specific place, but you can also board without one and sit in any available unreserved seat. This is common on many German, Austrian, Swiss and Scandinavian intercity services.
- Reservations not available. Many regional and suburban trains operate purely on a turn-up-and-find-a-seat basis. No reservation system exists.
Trains that require mandatory reservations
The following services almost always require compulsory reservations:
- Eurostar — London to Paris and Brussels. Your ticket is effectively your reservation; there is no separate step. Rail pass holders must also book a Eurostar-specific reservation with a supplement.
- French TGV trains. All TGV services operate on a reservation-required basis. Even if you hold an Interrail or Eurail pass, you must add a seat reservation to board any TGV.
- Spanish AVE high-speed trains (Renfe). All AVE and other Renfe long-distance services require reservations. The reservation is usually bundled into the ticket when you buy point-to-point; pass holders pay a separate reservation fee.
- Italian Frecciarossa and Frecciargento (Trenitalia) and all Italo high-speed trains. Reservations are mandatory on all Italian high-speed services.
- ÖBB Nightjet sleeper trains. You book a specific seat, couchette or private sleeper cabin. See the Nightjet guide for the cabin options and how to book.
- Most other night trains across Europe — including Snälltåget (Sweden), the Caledonian Sleeper (Scotland) and Trenitalia's overnight services — require berth reservations.
Trains where reservations are optional
Germany's ICE and IC long-distance services are the most prominent example of optional reservations in Europe. You can pay a small fee to reserve a specific seat, but many passengers simply board and sit wherever they like. This makes German trains especially convenient for pass holders and for spontaneous travel.
The same applies to most intercity trains in Switzerland, Austria (outside Nightjet), the Netherlands, Belgium, Denmark and much of Scandinavia. Thalys/Eurostar between Brussels and Amsterdam or Cologne is an exception — it requires reservations.
What reservations cost
Reservation fees vary widely by train type and operator:
- German ICE/IC optional reservation: a few euros per seat.
- French TGV pass-holder reservation: typically in the range of several euros to around twenty, depending on the route and quota availability.
- Spanish AVE pass-holder reservation: among the higher fees in Europe — reservations can cost a meaningful fraction of the point-to-point fare.
- Italian Frecciarossa/Italo reservation: usually modest, especially on Italo where pass holder reservations are competitively priced.
- Eurostar pass supplement: the highest in Europe for pass holders — this is one reason many travellers choose to buy a point-to-point Eurostar ticket rather than use a pass on this crossing.
- Night train couchette or sleeper: costs vary by accommodation class; a basic couchette reservation is much cheaper than a private sleeping cabin.
How to book reservations
If you hold a point-to-point ticket, the reservation is almost always included or offered at checkout on the national rail site. You rarely need to think about it separately.
If you hold a rail pass, reservations must be booked separately:
- For French TGV: via SNCF Connect, selecting the rail pass option at checkout.
- For Spanish AVE: via the Renfe website or ticket offices.
- For Italian trains: via Trenitalia or Italo directly.
- For Nightjet: via the ÖBB website.
- The Interrail and Eurail apps allow reservation booking for many trains directly within the app, which is the most convenient approach if you are managing your pass digitally.
Reservation quotas for pass holders are separate from — and often smaller than — the quota for regular ticket buyers. On popular routes in peak season, pass-holder reservation slots can sell out while the train itself still has general sale tickets available. Book as early as possible, especially for high-speed trains in summer.
What happens if you board without a required reservation
On reservation-compulsory trains, boarding without one is treated as travelling without a valid ticket. The conductor may issue a penalty fare or require you to pay the full walk-up fare on the spot, which is usually considerably more expensive than booking in advance. On some services you may simply be refused entry at the platform gate. This is not a grey area — the requirement is enforced.
Frequently asked questions
If I have a rail pass, do I still need a seat reservation?
Yes, on trains where reservations are compulsory — including all TGV, AVE, Frecciarossa and night trains. The pass covers the journey fare; the reservation (paid separately) is still required to board.
Can I reserve a seat on a German ICE in advance?
Yes, for a small fee — but it is optional. Many ICE passengers board without one and find a free seat. On busy routes and travel days, reserving gives you peace of mind that you have a confirmed place.
How do I know if a specific train requires a reservation?
The national rail site for the departure country will indicate at booking whether a reservation is included, optional or required. The Man in Seat 61 is also an excellent resource for country-by-country reservation rules. If in doubt, check before you board.
Are night train sleeper reservations refundable?
Reservation refund policies vary by operator and fare type. As a general rule, cheap advance reservations for couchettes and sleepers are non-refundable; more flexible fares can usually be changed for a fee. Check the specific operator's terms at the time of booking.
Sources and further reading:
- Reservation requirements by country and operator: The Man in Seat 61.
- Pass-holder reservation booking: Interrail and Eurail apps and websites.
- Operator booking sites: SNCF Connect, Renfe, Trenitalia, Italo, ÖBB, Eurostar.