LNER and Grand Central have both reported issues with services due to damage to the overhead lines between Retford and Newark North Gate.
LNER has said services have been cancelled or delayed, while Grand Central has said its services from Sunderland to the capital, which pass through Hartlepool, have altered or
National Rail Enquiries has said LNER customers can use Northern services between Doncaster, Retford and Sheffield at no extra cost.
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At 2.30pm, it reported a temporary repair has now been made and services are beginning to return to normal.
However, it said trains may still be cancelled or delayed by up to 30 minutes whilst service recovers.
It has also said that from Retford, rail replacement buses are in place at Doncaster, Retford and Newark.
A spokesperson said: "You can find the location of your bus replacement by checking station signs or by searching for your station on our station information pages."
The site can be found via http://twt.lt/a1r3