The First Mast to carry overhead wires for electrification of the East Coast Main Line was planted at Peterborough on 7th February, 1985. Exactly 2 years later, on 7th February, 1987, this 12,000th mast was put in place by The Prime Minister The Rt. Hon. Margaret Thatcher M.P. to mark the completion of one third of the total project and the start of work in the York Area.