Services are suspended on Greater Anglia between Broxbourne and Hertford East, and between Cheshunt and Cambridge due to overhead line problems. There are no replacement buses available and it is not clear when services will resume.
Elsewhere there are replacement bus services running on between Ipswich and Manningtree and between Manningtree and Liverpool Street.
There are also no services between Witham and Braintree due to a fallen tree on the line.
And services are suspended on Greater Anglia between Sudbury (Suffolk) and Marks Tey due to overhead line problems.
More top news
His top speed is believed to be the highest ever recorded in the UK by a rider carrying a pillion passenger.
The mayor took time out from City Hall to join Conservative party workers handing out leaflets in Uxbridge and South Ruislip.
No matter where you look, London's population is getting older - with the exception of one of the capital's boroughs.