Why were the railway line and tunnel originally built?

At 37.9 kilometres (23.5 mi), the tunnel has the longest undersea portion of any tunnel in the world, although the Seikan Tunnel in Japan is both longer overall at 53.85 kilometres (33.46 mi) and deeper at 240 metres (790 ft) below sea level. Long tunnels: Best estimates suggest that there are around 600 disused railway tunnels in the UK - some of them are extraordinary structures.

Essentially it was all down to the demand for coal. A campaign has accelerated to turn a disused railway line in Yorkshire into England’s longest cycle tunnel – instead of using £3m of public money to close it for ever.

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The speed limit for trains in the tunnel is … Many thanks to those of you who have sent in contributions. Pinnock Tunnel was originally on the line from St Blazey to Fowey and is the longest tunnel in Cornwall. This is a list of tunnels in Australia which includes any road, railway, ... it was the longest rail tunnel [citation needed] Boronia Tunnels: Cowan: Main North Line: Rail: 1,313 ... Six tunnels on a disused railway line Muntapa rail tunnel: Cooyar, Toowoomba Region: Cooyar railway line: Rail heritage: 280 920 Securing a future for one of England’s longest disused railway tunnels. The Pinnock Tunnel, formerly the railway from St Blazey to Fowey, closed in 1968. Below is a list of 45 which are over 1,000 yards in length. This abandoned railroad tunnel was first constructed in 1912, and now serves as pitch-black, 2.3-mile hiking and biking path beneath Snoqualmie Pass.

Snoqualmie Tunnel is part of the John Wayne Pioneer Trail in Iron Horse State Park. The disused structure, known as Thurland Street tunnel, served the city's former Victoria Station until its closure in 1967. ‘The story goes back to 1977 when this tunnel was there on the abandoned railway,’ said Mr Griffin, 66. ‘The owner of the cottage on the land wanted to build a rockery on the route. Research to expand our database of disused tunnels continues to pay dividends. This is the story behind Wales’ longest disused tunnel. Graeme Bickerdike. ... At 2,501 yards, it was the 11th longest on the railway network when traffic first passed through it and the difficulties imposed by the overwhelming influx of water caused the construction programme to overrun by two years.