Southampton-bound rail passengers are facing delays of around 30 minutes due to a broken down train.
The line was blocked between Basingstoke and Winchester stations, affecting trains on the route between London Waterloo and Southampton Central, after the train broke down shortly after 10am.
It has since been cleared but Network Rail says services are still facing half-an-hour delays as they return to normal. Disruption is expected until 6pm.
A spokesman for South West Trains said: "We are sorry for the disruption caused to your journey today."
Ticket are being accepted on Cross Country Trains between Basingstoke and Bournemouth in either direction.
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