Ken Livingstone visited Borough Tube station on Monday to see for himself the results of the multi-million pound refurbishment of the Northern Line station.
Borough is one of seven modernised and refurbished stations completed by Tube Lines
and are the first delivery of Transport for London's five-year, £10 billion investment programme.
The Mayor was joined joined by London Underground managing director Tim O'Toole and Tube Lines chief executive Terry Morgan.
"Transport for London is investing £10 billion over the next five years to improve and expand London's transport network," said Ken Livingstone, Mayor of London. "I'm delighted that we are starting to see cleaner, safer and more accessible stations.
"I look forward to more station improvements and more reliable Tube services, as we continue to invest in the Tube."
Station improvements include structural repairs and fresh paintwork throughout, new information boards on platforms and in ticket halls, better lighting, new CCTV security systems, upgraded PA systems and help points and improved seating.
Tube Lines is responsible for the maintenance and renewal of the Jubilee, Northern and Piccadilly lines, including 97 stations.
Tube Lines is due to deliver a new seventh carriage on all Jubilee line trains by early 2006; new signalling systems to increase capacity on the Jubilee line by 2009 and the Northern line by 2011; the modernisation or refurbishment of all stations maintained by 2010.
Borough station opened on 18 December 1890 as part of the City and South London Railway – the original deep-level Tube – which ran between Stockwell and King William Street.
• The Evening Standard reports that Tube bosses are considering closing the Waterloo & City Line – used by 37,000 commuters a day – for a number of months to allow a major track and signalling upgrade to take place.