Southern Railway said the problem was causing delays of up to 15 minutes for trains to and from Portsmouth Harbour, but all lines are now open.
Other delays include:
The 10.17am London Victoria to Littlehampton is due at 11.56am and will terminate at Haywards Heath, due to a shortage of train crew.
The 10.22am Brighton train to Lewes is cancelled, also due to a shortage of train crew.
Also cancelled is the 10.32am Southampton Central to Brighton, the 10.58am Lewes to Brighton, and the 11.03am Brighton to Portsmouth Harbour, due to a shortage of train conductors.
For more running information, readers can visit Southern’s running page here.
Don’t miss out on all the latest breaking news where you live.
Here are four ways you can be sure you’ll be amongst the first to know what’s going on.
1) Make our website your homepage
2) Like our Facebook page
3) Follow us on Twitter
4) Register with us by clicking on ‘sign in’ (top right corner). You can then receive our daily newsletter AND add your point of view to stories that you read here.
And do share with your family and friends - so they don’t miss out!
Always the first with your local news.
Be part of it.