Southern Rail said services are starting to run between Brighton and London Victoria after a person was struck by a train this morning (December 7).
The line has now reopened after the incident at around 10.30am, and Southern said the person is being treated for their injuries.
Services between Brighton and London Victoria were suspended while emergency services dealt with the incident. Gatwick Express services were also suspended.
Delays are set to last until 4pm, the rail operator said.
A Southern Rail spokesperson said: “It is with great sadness that we advise a person was struck by a train between London Victoria and East Croydon earlier this morning. The person affected is no longer on railway premises, and is being treated for injuries by the local paramedics.
“During this time, a limited service was operating in and out of London Victoria and two out of four lines along this route were out of use whilst the emergency services were in attendance. As of 11.40am, power to the lines was restored and all lines are now open.
“Due to the displacement of train crew and carriages, service alterations are likely to continue until 4pm. This will impact all services operating to and from London Victoria.
“Southern work closely with The Samaritans and support the work that they do. If you or someone close to you has been affected by this incident or other, there is always someone to talk to. Contact the Samaritans on 116 123 free at any time, on any phone.”