Rail services between Bletchley and Bedford were suspended on Tuesday afternoon after a man was struck by a train on the line near Woburn Sands.
The man died at the scene and police say the incident is being treated as non-suspicious.
A British Transport Police spokeswoman said: “BTP officers were called to the line between Bow Brickhill and Woburn Sands stations on Tuesday, 13 August, following a report that a man had been struck by a train.
“Officers from BTP and Thames Valley Police attended the incident, which was reported to BTP at 2.14pm, and is currently being treated as non-suspicious.
“Medics from South Central Ambulance Service also attended, but the man was pronounced dead at the scene.
“Enquiries are ongoing to establish the man’s identity and inform his family. A file will be prepared for the Coroner.”