CrossCountry and South Western Railway services are being majorly disrupted between Bournemouth and Brockenhurst.
The disruption means all associated lines are closed due to a fire next to the track, which has damaged the signalling system in the New Milton area.
Services will be cancelled or revised, with disruption expected until this evening.
Ticket acceptance is in place to get passengers to their destination, but this should be checked with the operator.
Journeys can be checked online via National Rail, CrossCountry, or South Western Railway.
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