Caversham Railway Tunnel, Dunedin

Exploring Caversham Railway Tunnel, Dunedin (Ever wondered what lies beneath the hills of Dunedin? The historic Caversham Tunnel is a fascinating piece of New Zealand’s railway past. Caversham Tunnel stretches 865 metres long, 4 metres wide and 5 metres high, with a gradient of 1 in 65 for much of its length before leveling out. It was built in a distinctive gothic arch style, giving it a unique architectural character that still stands out today. The tunnel is brick-lined at each end for the first 20 metres, protecting the sandstone from weathering. Its construction relied largely on manual labour, with some blasting used to help carve through the rock—an impressive feat for the early 1870s. The total cost of construction was about £9,500, which worked out to just over £10 per running yard. This was less than a third of the typical cost for single-line tunnels at the time, making it remarkably economical. Construction began in September 1871, with the tunnel breakthrough achieved in October 1872. The railway line opened to Green Island in December 1873, and the first passenger service from Dunedin followed in July 1874. By 1910, trains stopped using the tunnel as increasing rail traffic made the single-track design a bottleneck, leading to the construction of a more efficient dual-track route nearby. After rail use ended, the tunnel remained in public use as a walkway and cycleway from 1910 until 2006. It later came under the ownership of the Dunedin City Council in 1961, following a transfer of land from the railways, and infrastructure such as a major sewage line was installed. Caversham Tunnel runs from just south of the Barnes Drive traffic light intersection through to Kaikorai Valley Road. Today, despite its historical significance, the tunnel is closed to the public due to health and safety concerns. A forgotten tunnel, a glimpse into the past, and a reminder of how far engineering has come.) #ExploringWithMark #tunnel #railway