Two constabulary officers person been injured aft they stopped a stolen car successful an incidental described arsenic "like a country from Grand Theft Auto".
Hertfordshire Police said the conveyance travelled into the region and was recovered successful Cheshunt, wherever Essex officers attempted to talk to the driver.
It past made off, injuring 2 officers and damaging respective vehicles.
The achromatic conveyance was abandoned connected the railway enactment nearby, causing large disruption to obstruction services.
Greater Anglia and Stansted Express services into and retired of London person been affected but the lines person reopened, with disruption expected until 14:00 BST.
London Overground services were besides affected for a time.
An eyewitness, Ali, said helium was near "gobsmacked" by what helium saw astatine Cheshunt station.
"It was similar a country from Grand Theft Auto, the video game," helium said.
He was owed to drawback a train, but missed it owed to the incident.
Hertfordshire Police said it was made alert astatine astir 09:30 BST that the conveyance had travelled into the region from Essex.
It said its officers attended and assisted with the hunt and the conveyance was recovered abandoned connected the way successful Windmill Lane.
It said the conveyance was not struck by a bid astatine immoderate constituent and that a hunt to find the operator continued.
British Transport Police (BTP) said: "Officers received a study of a car connected the railway enactment successful Cheshunt astatine 9.43am today.
"Officers are presently connected country responding to the incidental alongside colleagues from Hertfordshire Police and Essex Police."
A Network Rail spokeswoman said the car had been taken disconnected the enactment and repair enactment to the way was owed to instrumentality place.
Witnesses to the incidental are asked to interaction Hertfordshire police.
National Rail Enquiries said each lines person reopened but trains whitethorn "continue to beryllium cancelled, delayed by up to 90 minutes oregon revised".
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