On Grand Central services, most of our seats will be reservable, however it's possible that all reservations may have been filled or that a service has had this ability removed, eg. on Bank Holidays.
If seat reservations are available, you will be given the option to choose any preferences you may have, such as table, power points and direction of travel. These preferences can be saved in your booking profile. Only when the booking is placed will confirmation be made that your seat reservation has been successful.
Seats may be reserved for children, but for a child under 5 a reservation can only be made if a suitable child ticket has been purchased.
On board trains, seat reservations are either shown in an overhead display or as paper seat reservation in the back of the seat.