Rail services between Haywards Heath and Brighton are experiencing delays this morning (Monday August 15).
Southern Rail said the 7.12am service from London Bridge to Brighton had stopped due to a fault on the line.
The train has come to a halt between Haywards Heath and Preston Park.
The incident is causing delays of up to ten minutes for commuters travelling southbound.
Disruption is expected to last until 9.30am, the rail service provider added.