This morning's Sun has linked yesterday's problems to staff working from home (one of this paper's obsessions)
www.thesun.co.uk

Train meltdown that hit networks traced to base where staff work just 2 days
A FAULT at a Network Rail base where staff are at their desks just two days a week triggered a meltdown on more than a dozen train networks yesterday morning. Hundreds of packed services were axed …

Not sure if there is any truth at all in that being a factor in resolving the problem yesterday.The GSM-R (Global System for Mobile Communications-Railway) network is a digital radio network that works in areas where analogue radio signals are poor.
It was installed across Britain between 2007 and 2014 for £1.86billion, including building 2,500 new masts.
But it was brought to a crashing halt when a tiny network card, a piece of computer hardware installed overnight during repair work, failed. It was fixed by 1pm after a replacement was put in.
Network Rail was last night urged to “seriously reconsider” its policy of allowing radio engineers to work from home.
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