UPDATE: Replacement bus service provided at Letchworth after signal failure means no trains between Royston and Cambridge

There are delays of up to 30 minutes after elctrical supply problems on the tracks at Potters Bar.

There are delays of up to 30 minutes after elctrical supply problems on the tracks at Potters Bar. - Credit: Archant

Disruptions to services between Royston and Cambridge will continue until tomorrow, passengers have been warned.

All trains heading north of London towards Cambridge will terminate at Letchworth and a rail replacement bus stopping at stations en route will be provided. Bus co-ordinators have been arranged to organise these services.

A spokeswoman for Great Northern Rail said: “All services are subject to change and short notice alteration.

“We would ask all passengers to check our website at www.greatnorthernrail.com for more information before travelling and to also check before they travel tomorrow morning.

“We would like apologise for any inconvenience caused.”

The delays are due to problems with overhead line equipment between Royston and Cambridge.