Track problems and train failures on London Underground (LU) have increased since it was partly privatised, according to new figures.
The public private partnership was opposed on safety grounds
Six of the 11 Tube lines have failed to meet targets for reducing delays and points failures are up 38%, according to this year's performance figures.
The figures, due to be published soon, were shown to the Guardian newspaper.
Bob Janowkski, from LU, said: "Some of these figures are a surprise to me... I thought they would have been better."
He added: "Where we are right now is not where we'd like to be."
The figures included a 23% rise in train failures and a 20% rise in track problems.
Mayor of London Ken Livingstone and the unions were opposed to the government's public-private partnership (PPP) plan for the Tube on safety grounds.
But the deal was completed in April and the consortiums involved, Metronet and Tube Lines, promised to spend billions improving the ageing network.
However the figures revealed on Monday suggest much of the network has not met targets for maintaining equipment such as toilets and public address systems.
Simon Hughes MP, the Liberal Democrat candidate for London mayor, said: "The first-year figures for London Underground under new management give real cause for public concern.
"They justify the widespread scepticism about the government's public-private partnership deal for the London Tube."