Chiltern Railways advised customers to avoid travelling during the heatwave on the 24th and 25th June.

They have now extended this to the 26th June and only travel if necessary due to the significant disruption expected.

Those who have tickets for the 24th, 25th and 26th can use them on the 27th and 28th June. Should passengers no longer want to travel, they will be eligible for a full refund.

Journeys should be checked online before travelling.

“This week’s extreme weather is going to continue into Friday so as a result we strongly advise you to avoid travelling until the weekend. Trains are running at greatly reduced levels as there is a significant risk to infrastructure.

“Running a reduced service means there is more resilience in the network and more chance for the rail network to recover. Trains which do run may experience significant delays and see very busy conditions.

“If you do need to travel, please stay safe, check your journeys on the morning you travel as planners are still being updated and carry a bottle of water with you at all times.”

Michael Stewart, Commercial and Customer Strategy Director at Chiltern Railways