Southern Rail reported the fault between the two stations at 9.13am this morning. (August 2)
"Services are now being delayed by up to 30 minutes via Chichester.
"Services due to run between Portsmouth/Southampton - London will now be diverted to run between London and Bognor Regis only."
Southern Rail are advising passengers to change at Barnham or Clapham Junction.
Signalling and Telecom specialists were reported to be on site at Chichester at 10.04am attending to this track circuit failure.