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4 February 2011, 15:55 | Updated: 16 February 2011, 14:55
The Mayor has reacted furiously to the latest delays on the tube network, Boris Johnson's said to be "incandescent" at delays on the Jubilee Line this morning.
Along with problems on the Metropolitan line this week as well it's lead to union leaders claiming that this week has been the worst of tube "chaos" this year.
And the RMT union says it shows that job cuts on the London Underground must be halted.
It's as new rosters come into effect on Sunday with ticket office opening hours being reduced.
Transport for London says more people are using Oyster and not buying tickets.