Mayor of London Boris Johnson has come under fire after Transport for London's seven-year investment plan made no mention of the promised tram extension to Crystal Palace.

Last year Mr Johnson vowed to push through the stalled tram extension, after a lack of funding caused the £170m plan to be abandoned in November 2008.

But the investment plan published by TfL earlier this week confirmed no money had been allocated for the extension, with funds instead being used for platform work at Wimbledon and the procurement of four additional trams, which will increase the frequency and capacity of services between Croydon and Wimbledon.

The report states 'TfL is working actively with stakeholders to further develop proposals for tram extensions, focusing particularly on how these might be funded.'

In May, at the first Mayor's Question Time after Mr Johnson's re-election, Steve O'Connell, London Assembly Member for Croydon and Sutton, called on him to commit to his election promise of a tram extension by including the project in TfL's work programme.

Mr O'Connell said he was disappointed the by the lack of investment.

He said: "I am disappointed there is no specific funding commitment in this present plan. We must remember there is a refresh of the plan every year, just because it isn’t in this particular one, it doesn’t mean it won’t happen.

"I have written to the Mayor expressing my disappointment and have also expressed my disappointment to Peter Hendy publicly at the transport committee.

"I do understand that the Mayor won’t be paying for all of it and that it will be a cocktail of funding. I will be urging TfL to talk to different parties on how we can move this further."

Upper Norwood councillor Pat Ryan criticised the Mayor for breaking his promise twice.

He said: "It is a kick in the teeth really, the people of Upper Norwood and Crystal Palace are the forgotten people and they have been let down again."

Croydon North MP Steve Reed said: "I share the view it is extremely disappointing, it's another broken Tory promise, broken as soon as we are past the election.

"Boris Johnson told us he would bring this tram extension, yet we see there is nothing proposed. The tram is not just about transport, its about regeneration and additional investment.

"I invite the Mayor to come back and explain to people in Upper Norwood what his plans are."

A spokeswoman for The Mayor said: "The Mayor is very much committed to further development of the system, which is why he has asked TfL to work closely with local boroughs now to develop further how these extensions could be funded, including from developer contributions and borough funding."