When the platforms closed in April 2011, more than 100 people were working around the clock to complete the works, which involved the removal of 800 tonnes of cast iron segments from the tunnel lining and the installation of more than 1,000 tonnes of new steel tunnel sections.
A full station upgrade which will transform the station by 2016 with increased capacity, new entrances and step free access.
David Waboso, Capital Programmes Director, said: 'We would like to thank passengers for their patience whilst the Northern line platforms have been closed.
'There is still further work to be done behind the scenes at the station and passengers will notice that the platforms only have a temporary render finish on the walls.
'Our priority has been to reopen the platforms as soon as the heavy civil engineering works were completed and they could be used safely by customers.
'As works to upgrade the station continue, we ask passengers to continue to bear with us.'
Will be good to see it finally open again and will be very interesting to see what it looks like when fully upgraded in 2016.