There were also problems on the London Underground's Jubilee Line because of signal failure at Neasden.
BBC: Signal failure delays commuters travelling west of London
The Heathrow Express cancelled its services due to a signal failure at Hayes and Harlington.
Commuters are being urged to avoid London Bridge, one of the hotspot travel stations during the Olympics after overcrowding due to a signal failure.
Our Londoners' tube will have more and better trains, more lines and more services, whilst Prescott's Public Private Partnership remains stuck in the tunnel with signal failure.
Some have referred to this as a commercial signal failure.
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It didn't get off to the best of starts as at 07:30 BST the Central Line had a signal failure and had to be part-suspended while engineers fixed it.
Here's the thing: the fact that the Kobo e-reader isn't a multitasker like the iPad and newer "hybridized" devices might not signal its failure in any way.
Failure could signal that the promised wave of drugs was simply an artifact of the bubble.
But investigators are focused on a failure of the train tracks themselves, as opposed to an error by engineers or a failure of the train's signal system.
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The 11 plus can be incredibly damaging to a child's esteem, because failure of the 11 plus sends a clear signal that you are just not good enough.
The failure of these numbers to stabilize or improve going into early 2013 could signal a significant area of weakness for the economy.
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