A trespasser on the railway is affecting train travel at Southampton Central.
All lanes are currently blocked, say South Western Railway.
All train services running through this station may be cancelled, delayed or revised and the disruption is expected to last until 3pm.
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A spokesperson said: "Whilst our teams assist the individual to a place of safety, the power to the track has been switched off and all lines are currently blocked.
"We are very sorry for any delay that this may cause to your journey."
Train tickets are being accepted on Bluestar buses between Southampton and the New Forest. Drivers will take train passengers on routes 6, 7, 8, 9, 11, and 12.
The same area was affected by overrunning engineering works between Totton and Brockenhurst this morning, with all lines blocked for a time and delays all morning.
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