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21 October 2010, 15:26 | Updated: 21 October 2010, 15:29
There have been more problems on the tube this morning.
The Jubilee line was suspended through central London during the rush hour because of a cracked rail.
There were also delays and cancellations on other lines this morning.
It's the third day this week we've had major disruption on the Underground.
Tube bosses have already been forced to publicly apologise after passengers had to walk along tracks when trains were stranded on Monday and Tuesday.
One union says it's been a week of "chaos".