The 12615 / 12616 Grand Trunk Express (commonly called G.T. or G.T. Express) is a daily Superfast Express train on Indian Railways, running between New Delhi and Chennai Central. It is a historic train and is one of the oldest trains starting services in 1929. It originally ran between Peshawar in Undivided India(then capital of the North West Frontier Province) and Mangalore Central in Karnataka (then in the Madras Presidency).. From September 2021, it runs with modern new LHB coach with revised coach position.