sentences:  The line was authorised on 24 July 1876 and the Westerham Valley Railway Company was formed to oversee its construction and to take over formal ownership.An agreement was then concluded in 1879 with the South Eastern Railway by which the latter would undertake the construction works and eventually operate the line.The actual cost of construction was in the region of £70,000 and the line opened on 7 July 1881.