Work began in 2012 with the terminal platforms adjacent to St Thomas Street, reducing the number from nine to six and extending them to accommodate longer 12-car trains. Through platforms were increased from six to nine, all of which catered for 12-car trains. In the redeveloped station, Charing Cross services were assigned four new dedicated platforms (6, 7, 8 and 9), and Thameslink services to platforms 4 and 5. The existing platforms for Cannon Street services on the north side of the station were also rebuilt.