The original tunnel through the North Downs was constructed under the supervision of the engineer John Urpeth Rastrick for the London and Brighton Railway (L&BR) between 1839 and its opening on 12 July 1841.
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Eventually the LB&SCR gained Parliamentary approval to build its own independent line between Coulsdon North and Earlswood which bypassed the SER stations of Coulsdon South, Merstham and Redhill.
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