The work at Hanslope Junction and nearby stations took place during an 11-day closure.
Two former railway lines around Northampton could be reopened under latest plans published by the Reform-led West Northamptonshire Council (WNC).
Passengers have been warned to expect major disruption between Northampton and London Euston after a person was pronounced dead on the tracks. British Transport Police (BTP) were called to Berkhamsted ...