Which trains can't be reserved with the Interrail reservation service?
The Interrail reservation service can make reservations for 95% of European trains. We're unable to make reservations for the following trains:
Domestic trains in the U.K., Ireland and Portugal.
International trains in Ireland, Bulgaria, FYR Macedonia, Greece, Montenegro, Serbia and Turkey.
You can find alternatives for the Thello in the Interrail timetable. Read the instructions on that page for more information.