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Southeastern services have now returned to normal after a lorry hit a railway bridge near West Malling.
At around 1.20pm police were called to the accident in Church Road, Offham.
Services between West Malling and Borough Green were running at a reduced speed while the British Transport Police and Network Rail investigated.
All services are now running as expected.
A Network Rail spokesperson said: “We can confirm that at approximately 1.30pm today we received a report that a vehicle had struck our rail bridge near West Malling although the vehicle was no longer present.
"The line speed was reduced temporarily while an inspection took place but no repairs were required and regular line speeds were resumed.
"We are supporting the police with their investigation.
"Bridge strikes cause delays for our passengers and are often costly to repair and we call on drivers of high-sided vehicles to check their routes before setting out and to be aware of height restrictions."