Leonards, out of had been excavated. Construction of the line between Tunbridge Wells and Bopeep Junction cost in excess of £500,000. Deficiencies in the construction of the tunnels Supervision of the construction was lax, which enabled the contractors to skimp on the lining of the tunnels. This manifested itself in March 1855 when part of the brickwork of Mountfield Tunnel collapsed. An inspection of Grove Hill, Strawberry Hill and Wells tunnels revealed that they too had been constructed with too few layers of bricks. Grove Hill Tunnel had been built with just a single ring of bricks and no filling above the crown of the brickwork. The SER took the contractors to court and were awarded £3,500 in damages. However, rectifying the situation cost the company £4,700. Although the contractors had charged for six rings of bricks, they had only used four. Due to the cost of reboring the tunnels, this had to be rectified by the addition of a further two rings of brickwork, reducing the width of the tunnels by . The result of this was that the loading gauge on the line was restricted, and special rolling stock had to be built, later becoming known as Restriction 0 rolling stock. This problem would affect the line until 1986. Wadhurst Tunnel collapsed in 1862 and it was discovered by the SER that the same situation existed there too. Rectification cost £10,231. By 1877, only one train was permitted in Bopeep Tunnel at a time. The tunnel was partly widened in 1934–35. In November 1949, serious defects were discovered in the tunnel. Single-line working was put in place on 19November, but the tunnel had to be closed completely a week later. The tunnel was partially relined with cast iron segments. It reopened to traffic on 5June 1950. Mountfield Tunnel was underpinned in 1938–39, remaining open with single-line working in operation. It partially collapsed on 17November 1974, resulting in single-line working until 31January 1975. The line was then closed until 17March whilst the track was singled through the tunnel. Openings The line was opened by the SER in three main stages: Tunbridge–Tunbridge Wells, Tunbridge Wells–Robertsbridge and Robertsbridge–Bopeep Junction. A temporary station was opened at Tunbridge Wells on 19September 1845 while Wells Tunnel was completed. The temporary station later became the goods depot. Tunbridge Wells (later Tunbridge Wells Central) station opened on 25November 1846. The Tunbridge Wells–Robertsbridge section opened on 1