A Chinese company will help operate one of the biggest rail franchises in London after a surprise announcement by the Government.

MTR will run South West Trains (SWT) with the giant First Group for seven years from August, it was announced today (March 27).

First MTR will take over from Stagecoach, which currently runs SWT services across south east England to and from London Waterloo.

The Rail, Maritime and Transport (RMT) union said the Chinese state was now set to make "a killing at the British taxpayers' expense".

The Department for Transport (DfT) said: "First MTR South Western Trains Limited will use the experience of one of its major shareholders MTR, who operate the busy Hong Kong metro, to deliver smooth and rapid journeys for passengers travelling around London's suburban network.

"Faster journeys will be delivered through a consistent fleet of new suburban trains offering a regular, metro-style service. Passengers can look forward to more space."

Transport Secretary Chris Grayling said it was more "great news" for rail passengers following the recent announcement of a consultation on the South Eastern franchise.

Mr Grayling said: "First MTR South Western Trains Limited will deliver the improvements that people tell us they want right across the South Western franchise area, from Bristol and Exeter, to Southampton and Portsmouth, to Reading, Windsor and London.

"We are delivering the biggest rail modernisation programme for over a century and this franchise will deliver real changes for passengers, who can look forward to modern trains, faster journeys and a more reliable service."

The Government said the new operators will oversee a £1.2billion investment to improve journeys for millions of train passengers.

The new franchise will see 22,000 extra seats into London Waterloo each morning peak and 30,000 extra seats each evening peak, as well as a fleet of 90 new trains, providing more space for passengers on Reading, Windsor and London routes.

There will be more frequent and additional services across the franchise, faster journeys across the network and earlier and later trains.

Stagecoach said it was disappointed that it had been unsuccessful in its bid for the new franchise.

Group chief executive Martin Griffiths said: "We are proud to have operated the network under the South West Trains brand for more than 20 years and we are disappointed that we have been unsuccessful in our bid for the new franchise."

FirstGroup chief executive Tim O'Toole said: "We are delighted that our partnership with MTR has been selected by the DfT to run the South Western rail franchise, a key part of the country's railway network which millions of people rely on every day.

"Our successful bid will deliver the tangible improvements that customers and stakeholders have told us they want from this franchise.

"Passengers can look forward to new and better trains, more seats and services, quicker journey times, improved stations and more flexible fare options."

RMT general secretary Mick Cash said: "Once again the Government have refused to consider the public sector option for a major rail franchise and instead it's a foreign state operator, in this case the Chinese state, which is set to make a killing at the British taxpayers' expense.”