Rail passengers in London are advised to allow extra time for journeys today while rehearsals of travel management plans for the Olympics take place.
This will mainly affect London Bridge station where Southeastern has put a queuing system in place and passengers may have to use a different entrance or exit.
London Bridge will be one of the main travel hotspots during the Games.
Other stations where there may be some disruption during the crowd control testing are Charing Cross, Cannon Street, Waterloo East and Victoria.
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