There are delays between Norwich and London because of a tree leaning on power cables on the line to Diss.
A shuttle bus is currently in operation between Norwich and Diss and there are delays of about 30 minutes on both directions of the line.
Network Rail and Greater Anglia do not know when a normal service will be resumed. There are currently engineers on site who are looking at removing the tree which is causing the obstruction.
Today sees the tenth anniversary of the Norwich to Cambridge rail service.
The direct service was first introduced in September 2002, when just over 300,000 people used the line. Now almost a million people use the service every year.
Prior to the service being introduced passengers had to change at Ely.
Greater Anglia train services between Norwich and London Liverpool Street have been cancelled after a person was hit by a train at Diss. The line was shut around midday, the first departure from Norwich will now be at 1300. Disruption to services on the line is expected to continue until 1500.
Passengers travelling on Greater Anglia trains - which operate across East Anglia - are the least satisfied anywhere in the country.
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