All trains between Peterborough and Grantham were delayed by up to two hours yesterday afternoon, Tuesday August 30.
And the delays continued this morning with several trains being cancelled.
It is believed the issue was an overhead line failure which engineers believe they have now fixed.
A spokesman for Virgin Trains said: “Trains between these stations may be delayed by up to 2 hours or cancelled. Disruption is expected to continue until the end of the day.
“If passengers wish to abandon their journey due to today’s disruption, all tickets will be valid for travel tomorrow.”
Services affected include:
* East Midlands Trains between Norwich and Liverpool Lime Street
* Grand Central between London Kings Cross and Sunderland / Bradford Interchange
* Hull Trains between London Kings Cross and Hull
* Virgin Trains East Coast between London Kings Cross and Leeds / Edinburgh