Etheridge railway line
The railway stations at Mount Surprise, Einasleigh and Forsayth and the route of the Etheridge Railway between Mount Surprise and Forsayth, including surviving railway buildings, rails, sidings, turning forks, loading banks, stone pitched bridges and culverts, stone cuttings, sandboxes, water tank, signage, and signals and points infrastructure, are important surviving evidence of the efforts of the Chillagoe Railway and Mines Company to supply copper ore to its smelters at Chillagoe.
South Eastern main line
In 1857, a new direct connection was put in at Tunbridge Junction, enabling trains to reach Hastings without reversing. The station at Tonbridge was rebuilt on a new site just west of the original. The LCDR built their line to Dover, which opened in 1861, providing a route to London that was shorter that the SER line via . In May 1862, authorisation was obtained to construct a new railway from , London to Tunbridge, which reduced the distance from London to Tonbridge and points east by about . Construction of the tunnels was well-supervised by the SER, for it had been discovered by this time that the contractors who had built the tunnels on the Hastings line had skimped on the construction by using an insufficient number of rings of bricks to line the tunnels. Rectification resulted in a restricted loading gauge on that line, a situation that was to last until 1986. This "cut-off" line, in length, reached on 1 July 1865. This station was replaced with a new one further south which opened on 2 March 1868 when the line was extended to and . The line between Sevenoaks and Tunbridge opened to freight in February 1868, and passengers on 1 May 1868. Sevenoaks Tunnel took five years to build, from 1863–68, It is long. On opening, it was the fifth longest railway tunnel in the United Kingdom. This new line meant that the old main line from Redhill was relegated to branch line status.