Rail passengers travelling to London from Norwich faced delays and cancellations early on Monday morning after a body was found on the line. British Transport Police closed the track between Norwich and Diss, disrupting services from Norwich to Liverpool Street in London.
The line was re-opened just before 0730 BST, though One Railways told commuters to expect delays during the rush hour.
There will be delays for passengers down the line in Suffolk and Essex.
All passengers are advised to check their train times before travelling, either by ringing 08457 125 678 or by looking at www.onerailway.com.
An investigation by British Transport Police began after the body was found on the line at Lakenham just outside Norwich at 0600 BST.