Lines between Maidenhead and Slough were affected due to Network Rail signalling problems earlier.

BBC: Signal failure delays commuters travelling west of London

Its goal is to map the complex network of signalling reactions which cells use as an internal messaging system, and then feed this information into other computational models.

ECONOMIST: REPORTS: The heart of the matter | The

Network Rail said signalling was fully restored at 09:30 GMT.

BBC: Signal failure halts Swindon train services

On the rail network, cold conditions caused signalling problems and there were delays in a number of areas.

BBC: UK snow and ice continue to disrupt travel

During that time Network Rail will complete track relaying and signalling work, refurbish platforms and remove the last part of the old footbridge.

BBC: Reading Station partly shut during upgrade works

Network Rail has upgraded power supplies and signalling systems and lengthened 41 platforms at 12 stations on the Midland main line north of London to accommodate the new trains which are nearly 270 yards (250m) long.

BBC: Longer trains set to ease congestion on Thameslink line

Network Rail, responsible for the country's track and signalling, said it was "deeply sorry" for Mrs Harding's death.

BBC: Level crossing death: Signalman and Network Rail fined

Network Rail said a blown transformer at Central Cardiff station at 09:40 GMT knocked out signalling in the Cardiff area but it is not yet known if flooding was the problem.

BBC: Flooding: Christmas rail travel resuming in south Wales

One of the underlying causes of the network's bad performance is the time taken to recover from routine failures, such as in signalling or track.

ECONOMIST: Railways: Anyone know how to run a railway? | The