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On June 8, 1872, the London & North Western Railway obtained powers to quadruple its main line, and a new tunnel was bored for the up and down slow lines.
2019 October, “Railtalk: HS2 delay - time for lateral thinking”, in Modern Railways, page 7:
Quadrupling the short remaining stretch of three-track railway north of Rugby, left over by the turn of the century modernisation, is a possibility that could be pursued.
2020 April 22, Paul Shannon, “Felixstowe: Is 47 trains a day achievable?”, in Rail, page 52:
A long-term aspiration is to quadruple the cross-country route between Peterborough and Werrington Junction, removing any conflict between trains on the Spalding and Leicester lines.