BBC news, 4/24:
Rail signal upgrade 'could be hacked to cause crashes'
A hi-tech signalling system that will eventually control all of Britain's trains could potentially be hacked to cause a serious crash, according to a scientist who advises the government.
Prof David Stupples told the BBC that plans to replace ageing signal lights with new computers could leave the rail network exposed to cyber-attacks.
UK tests of the European Rail Traffic Management System are under way.
Network Rail, which is in charge of the upgrade, acknowledges the threat.
"We know that the risk [of a cyber-attack] will increase as we continue to roll out digital technology across the network," a spokesman told the BBC.
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