Meanwhile, a passengers' group has called on the government to establish a transport resilience task force for south-west England.

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Getting the right balance between road and rail will be a task that stretches the strategic transport authority.

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The task now for London is ensuring the efficient transport network during the 2012 Games is not "just an exceptional, one-off achievement only beneficial over the Olympic summer", Ms Pidgeon said.

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The task force is comprised of civil servants, NIR staff and members of the parent company, Northern Ireland Transport Holdings.

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