Signalling problems are causing delays on South Yorkshire's rail network this evening.
An earlier electric fault near Doncaster had caused problems but was later fixed. The area was then hit by signalling problems near Fitzwilliam.
Although lines are now open there are major delays expected until after 6pm as services continue to recover.
Delays of up to 70 minutes are expected between between Leeds, Doncaster and Sheffield.
Replacement buses are being put on between Moorthorpe and Swinton.