Until further notice, single seats can be booked on ÖBB Nightjets in the seating carriage, couchette carriage with 4-person compartments, or in the sleeper carriage. For maximum privacy, the compartments in the three comfort categories can also be booked as a separate (private) compartment. This enables you to travel in a compartment with just your family or friends, without having to share it with other passengers who are not in your group.
On the connections from/ to Rome, Milan and Livorno only entire compartments can be booked due to official requirements: Private compartments in the seat car and couchette, sleeping car/ sleeping car deluxe only for exclusive use in single/ double/ triple occupancy. Tickets for single seats that have already been purchased remain valid, but train staff can allocate other seats in the same travel category so that the minimum distance can be observed. Vehicle transport to/ from Livorno can still be booked unchanged.
You can find full details about private compartments on the website or by calling ÖBB customer service on 05-1717.