The politician responsible for transport in Birmingham, Councillor Len Gregory, has previously supported the creation of an underground rail network in the city.

BBC: NEWS | UK | England | West Midlands | Approval for city tram extension

Vintage Tube logos form the background of a commemorative Oyster card to mark the 150th anniversary of London Underground rail service in London.

BBC: Oyster card celebrates 150th Tube anniversary

Declared the European Green Capital in 2010, Stockholm is investing in new construction like the City Line tunnel, which will put commuter rail lines underground and double the number of trains able to move through the city.

BBC: Living in: Stockholm

London Underground is to be prosecuted by the rail regulator over a runaway engineering train.

BBC: Runaway Northern Line Tube train: Charges brought

At the moment, despite its lamentable performance, the company is being rewarded by John Prescott, the transport minister, for taking two big problems off his hands: the Channel tunnel rail link and parts of the London Underground.

ECONOMIST: Mending Britain��s rotten railways

Two 24-hour strikes over the sacking of two London Underground (LU) drivers have been called off by the Rail, Maritime and Transport (RMT) union.

BBC: Tube strikes over sacking of two drivers called off

It is the first orbital rail route for London since the Circle Line on London Underground was built in 1884.

BBC: London

It would be as disastrous for the London Underground to separate management between infrastructure and operations as it has been on the heavy-rail network.

ECONOMIST: Language barriers

It has a key role in building the Channel Tunnel fast rail link and it is also a leading contender to take over the infrastructure contract for London Underground.

ECONOMIST: Railways