The extension would run from Harrington through to Penge and then Anerley Roads and then link to either the Crystal palace bus or rail stations.
Mr Livingstone’s campaign say the cost of the project would be “very modest” and could be funded out of surpluses at Transport for London.
Opponents have previously disputed Labour’s claims about the size of TfL’s surpluses which Mr Livingstone has also said would help fund a fares cut.
Ahead of a campaign visit to Croydon the former Mayor said: “My platform is based on making Londoners better off, which is why I have announced a Fare Deal cut in fares which will leave the average London fare payer £1,000 better off over 4 years.
“But there are additional transport projects we can do because of the sheer size of the surpluses at TfL. The extension of the Croydon Tramlink extension is about building for our future”.
The plan has been been backed by Labour’s former Transport Sectary Lord Adonis who said: “Ken has set out a bold policy which cuts back on fares after four years of inflation-busting hikes from the Tory mayor Boris Johnson.
“I’m delighted the Labour candidate is demonstrating once more his life-long commitment to cheaper fares and investment in the transport network”.
Candidates for Mayor include Jenny Jones (Green party), Ken Livingstone (Labour), Lawrence Webb (UKIP) Boris Johnson (Conservative) and Brian Paddick (Liberal Democrat). A full list of candidates can be found here.
Candidates standing as London Assembly constituency members can be found here. Candidates for the 11 Assembly London-wide seats can be found here.
