Rail operator LNER has advised passngers NOT to travel on Sunday.

The updated advice came late on Saturday evening, after a day of disruption on the East Coast Main Line and elswhere which saw many high speed trains cancelled.

The problems were caused by Hitachi taking some Class 800 passenger trains - including LNER'S Azumi trains - out of service to carry out precautionary checks. It followed the discovery of cracks in the suspension of some trains.

The disruption affected Hitachi Class 800 trains operated by LNER, TransPennine Express, Hull Trains and GWR, which runs the Great Western Main Line between Bristol and Paddington.

Some high speed train services through York began to resume on Saturday afternoon – but operators warned services would continue to be disrupted at least for the rest of the day, and possibly on Sunday as well.

Both TransPennine Express and Hull Trains said on Saturday afternoon that their Class 800 trains - including TPE's Nova 1 trains - were being brought back into service after being checked.

LNER initially said that more than half of its Azuma trains had also been checked and returned to service.

But shortly after 8pm on Saturday it issued a revised statement warning passengers not to travel on Sunday.

The company said: "Due to a number of Hitachi Class 800 trains from several train companies being taken out of service for checks as a precautionary measure, there will be a reduced number of services in operation across the LNER route.

"The issue is being investigated and once trains have been checked, we hope to be able to release them back into service as soon as possible. 

"We apologise for the disruption caused and are advising customers not to travel on Sunday May 9."

Tickets will remain valid until Sunday May 16, LNER said. "Alternatively, customers can claim a refund from their original point of purchase.

"Seat reservations are required on all LNER services for anyone planning to travel. We recommend customers check our website, lner.co.uk for the very latest travel information and updates.”

Earlier, TransPennine Express said that, while it was reintroducing its Nova 1 trains back into service, the disruption caused would 'continue to have a significant impact on our services between Newcastle and York for the rest of the day'. It added: "We apologise to our customers for any disruption caused,” a spokesperson said.

Hull Trains said: “We are pleased to confirm that following thorough checks by Hitachi on the Hull Trains Fleet of Class 800 series trains, services will now resume as normal.

“Due to the disruption we expect our services to be extremely busy and we cannot guarantee that social distancing guidelines will be adhered to. Please wear a face covering (unless exempt). Refunds will be provided for this morning’s cancelled services.”

Hitachi apologised for the disruption on Twitter.

“Some Class 800s have been taken out of passenger service as a precautionary measure to allow for thorough investigations,” the company said. “We are working with partners to resolve this issue as quickly and safely as possible. We would like to offer our sincerest apologies to passengers impacted.”