78-yr hidden underground mail rail in London set to become tourist attraction

The city of London is set to add an 89 year old hidden underground mail rail to its list of tourist attractions come 2017.

According to CNN, the Mail Rail is a 23-mile network once used by the UK's Royal Mail postal service to transport letters and parcels beneath the city.

Reports say its small electric engines entered service in 1927, shuttling between eight main sorting depots, including Paddington in the west and Liverpool Street in the east.

The line closed 11 years ago when some depots were shuttered and sold off.

In spite of the time passed, not much of the line has changed as old engines and equipment sit parked in stations.

Upon reopening to the public, the remaining trains will be converted to allow visitors to take a short ride beneath the Mount Pleasant Post Office in the city's Clerkenwell district.