An update has been issued by South Western Railway on its services in Wiltshire.

SWR says it will reinstate its full West of England timetable on Friday, April 28.

An amended timetable was put in place on Friday, April 21, following a problem with its high-speed diesel trains.

The issue was related to the diesel fuel used by the diesel trains that operate services in the Basingstoke, Exeter, Romsey, Salisbury and Yeovil areas.

The problem, which is still under investigation, caused fuel filters on several trains’ engines to become blocked, impacting their acceleration and top speed.

Neil Drury, SWR’s engineering director, said: “We’re sorry for the disruption that customers in the Basingstoke, Exeter, Romsey, Salisbury and Yeovil areas have felt since last Friday.

"It was a difficult decision to amend our timetables and we have worked hard to restore services as quickly as we can.

“We have taken a number of steps to mitigate the problem, which we believe is related to the contamination of diesel fuel.

"Many of our trains have returned to the levels of performance that we expect and while there is still work to do, we are pleased to be able to restore the full timetable on Friday.

“Once again we’re very sorry for the disruption and grateful for the continued patience of our customers."

To restore services as soon as possible, engineers at SWR’s Salisbury train care depot have performed enhanced maintenance on all affected trains.

Fuel tanks at the depot, which provide 35,000 litres of fuel to the diesel fleet every day, have been deep cleaned and are also using fresh fuel.

These steps have restored train performance, allowing services to gradually be restored.

On Tuesday, April 25, hourly services between Salisbury and Southampton Central via Romsey were reinstated, followed by direct services from Basingstoke to Exeter St Davids on Wednesday, April 26, removing the need for customers to change at Salisbury.

On Thursday, April 27, some direct services from London Waterloo to Exeter St Davids were restored ahead of the full timetable being reinstated on Friday, April 28.

Journey planners are up to date and customers can check their journeys at southwesternrailway.com/plan-my-journey.