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Final preparations are under way to open to the public the underground train network that many will never even have heard of.

The London Post Office Railway, also known as Mail Rail, stretched from Whitechapel in east London to Paddington in the west and ran for 22 hours a day. It closed in 2003.

The new Postal Museum opens in July 2017 and will include the opportunity to ride a through part of the tunnels on the modern equivalent of a mail train.

The Â鶹Éç Travel Show’s Henry Golding goes underground to find out more.