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The last of an old-style of District Line Tube train is set for a final journey after almost 40 years in service.

The “D Stock” trains, with a capacity for more than 800 people, have carried millions of passengers since they were introduced in 1980.

Transport for London has gradually replaced the trains with a new fleet of “S Stock” walk-through air conditioned trains which operate on 40 per cent of the network including the District, Circle, Metropolitan and Hammersmith and City lines.

The last D Stock train is set for a day-long “farewell tour” of the District line on May 7 to celebrate its near 40 years of service.

Its final day of all day public service was on Friday.

For the tour, the special six-car D Stock train will operate as Train 755 and travel to all parts of the District line except the High Street Kensington to Edgware Road section.

It will also visit Northfields on the Piccadilly line.

Each D-Stock train has 280 seats which are mostly longitudinal with a double pair of transverse seats in the centre of each car.

Tickets for the tour, organised by London Transport Museum, are being sold at a price of £50 for adults and £25 for children aged 11 to 16.

Passengers will depart from High Street Kensington shortly before 10am with an hour-long break for lunch at Northfields. It is scheduled to end at Ealing Broadway shortly before 6pm.

A TfL spokesman said: “The fully air-conditioned, walk through trains serve on the District, Circle, Metropolitan and Hammersmith and City lines – covering 40 per cent of the network.

“The introduction of these trains mark a key stage in the Four Lines Modernisation project that will provide faster, more reliable and more frequent journeys for millions of Londoners, boosting capacity on the lines by a third.”

For ticket information visit the London Transport Museum website.