When a passenger tries to book a ticket or make a reservation, and the system indicates regret, it means that there are no seats or berths available on that particular train or for that specific class of travel.
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The regret status is often displayed when all the seats or berths in a particular train or class have been booked, and no more reservations can be accommodated. It signifies that the ticket or reservation request has been denied due to unavailability.
Yes, Trainline is legitimate. Their app and website connect directly to rail and coach carriers' ticketing platforms so every ticket you buy through Trainline is valid for travel.