Rail replacement buses are running between Pitsea and Grays - with journey times extended by up to an hour.
The disruption is expected to last until lunchtime.
More top news
More than 300 dogs have braved the weather in an attempt to break a world record at Battersea Park in south London.
Jailed former celebrity publicist Max Clifford has died after collapsing in prison.
The first snow of winter has arrived in London causing major disruption for road and rail users.