An extreme heat weather warning has been issued for this week, and train operators are warning that services could be disrupted.

Great Western Railway said speed restrictions are being imposed between Reading and London through the Thames Valley, where temperatures could reach 37 degrees later this week.

The hottest weather is expected in south east England, but National Rail has warned that the weather is also affecting some routes in south Wales, and direct services between Pontypridd and Cardiff Bay have been cancelled.

GWR and Network Rail performance director Daryn McCombe said: ‘We want to keep our customers safe during this period of extreme heat, which is why we are taking the precautionary step of amending services at the hottest times of day. We know this is disruptive and we’re sorry for the inconvenience it will cause, but customer safety must come first.

‘We’d encourage everyone travelling with us to check before they travel, allow extra time and bring water with them.’

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