The first phase of the new East London Line will open tomorrow, Transport for London confirmed today.
The section between Dalston Junction and New Cross/ New Cross Gate had been scheduled to open two weeks ago.
However it was called off at the last minute.
This was either because of unforeseen technical problems and political wrangling, or because of the evil all-powerful hands of Ken Livingstone - depending on your level of paranoia.
Boris Johnson will officially open the line at 9.45 tomorrow morning in Dalston Junction station.
Opposition leaders on the London Assembly have been invited, but are unlikely to attend due to concerns that Boris will turn it into a campaign event.
Liberal Democrat Chair of the london Assembly Transport Committee Caroline Pidgeon said today:
"Right in the middle of a General Election campaign, the Mayor is desperate to claim credit for something he didn't initiate. The East London Line opening will be welcomed by many Londoners, but must not be used as a political football.
"The fact that two 'official openings' have already been postponed on technical grounds clearly demonstrates that political convenience has been the key factor driving the date of the official opening."
Transport for London have denied this and insist that the Mayor's attendance will help publicise the line and increase their revenue.
A senior source in the organisation told me earlier this month:
"We want the revenue and the experience of people using it and we want the exposure the Mayor will get us by opening it..."Ken Livingstone would have not given it a second thought to open a £1billion new railway for London and his reason for doing so would have been the same as ours, which is that it is a great thing for London."
A limited "preview service" will run on the Dalston - New Cross section for the next month, with a full service commencing towards the end of May.
The remainder of the Line is expected to open on the 23rd May.