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7 March 2011, 11:22
There's been a big increase in delays and station closures on the tube.
Labour says new figures show that passengers are spending 10 per cent more time on delayed trains than a year ago, and a third longer on trains on the Central line.
But Transport For London say the figures are completely wrong because they compare a month when there was strike action with another were there were no strikes.
It comes as plans are being looked at by TfL to run the tube 24 hours a day during the Olympics.
Hundreds of thousands of extra visitors are expected during the Games next year, putting an extra strain on the transport system, including the tube - which already used by more than 3 million passengers every day.