Abellio Greater Anglia train (Image: Archant)
Trains running between Stansted Airport and Cambridge are delayed by up to an hour.
A broken down train between Great Chesterford and Whittlesford Park is causing delays on the Abellio Greater Anglia and CrossCountry services between Cambridge and London Liverpool Street.
Passengers are able to use Great Northern services while the issue continues.
Trains are expected to be delayed until 3.30pm.
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