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.
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The mayor claimed 'international despots and criminal rings' were using phoney companies to buy homes in the capital.
Their twisted romance revolved around fictional Facebook characters, and the 8-year-old girl was seen as a threat.
Passengers were forced to jump the ticket barriers to avoid being crushed by the crowd.