A person has been hit by a train between Royston and Cambridge this morning.
All lines are blocked between the two stations while emergency services deal with the incident.
Great Northern has advised passengers travelling between those stations to delay their journey until later today.
Services that run between London and Cambridge, Ely and Kings Lynn will instead run between London and Letchworth Garden City.
Rail replacement buses will run between Royston and Cambridge, calling at all stations.
If you are affected by this incident and would like mental health help and support, you can call the NHS on 111 and press option 2 for the 24/7 first response service.
Alternatively, contact a Samaritan on 116 123 or via email at jo@samaritans.org.
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