Question: What are the operating years of this British train operating company that was the last operator of King's Cross Thameslink railway station?
Sentence (from "Southeastern (train operating company)"): Southeastern trains operate along three main routes: the Southeastern Main Line from London Cannon Street and London Charing Cross to Dover via Sevenoaks; the Chatham Main Line between London Victoria and Dover/Ramsgate via the Medway towns; and High Speed 1 from London St. Pancras.
Relevant evidence: No