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27 March 2012, 15:23 | Updated: 27 March 2012, 17:16
Commuters were delayed for up to 2 hours on the trains this morning after a signalling failure in Bedford.
It affected First Capital Connect trains Thameslink route on the Midland Mainline.
The fault was fixed by 8am but services did not return to normal until 2pm this afternoon, twelve hours after the signalling fault was first discovered.
Network Rail told Heart it took so long because trains were stuck in the wrong place while repairs were being carried out.
Martin Frobershire from Network Rail says there will be an investigation following:
"We understand its a failure of the main power cable but don't yet understand precisely what’s happened with that what we'll be doing is a full technical investigation and the recommendations from that will help us to prevent future failures"