Ice and snow continue to cause problems on the railway this morning (Monday March 11).
Poor rail conditions are causing disruption in the Havant and Pulborough areas and signalling problems are causing disruption in the Portsmouth Harbour area.
There are currently no trains from Barnham to Horsham via Pulborough.
Journeys from Horsham to Barnham may be delayed by up to 25 minutes.
This problem is expected to continue until around 11am.
Buses are running from Barnham to Horsham on the hour and at 30 minutes past the hour.
Buses are also running between Horsham and Barnham on the hour and at 30 minutes past the hour.
Journey times are likely to be extended by up to 60 minutes.
Journeys to and from Portsmouth Harbour are also being delayed by up to 45 minutes.