- Watch the report with our Transport Correspondent, Mike Pearse.
More rail disruption is in store for passengers travelling in the south-east as network closures are announced.
The closures come as work begins to upgrade, what Network Rail is calling, '"the most congested part of Britain's railway".
Work will be carried out on the line between Three Bridges, Brighton and Lewes. Between now and May 2019, it's been announced that 34 days of closures will take place.
The £300 million project includes work on a new track, signals and drainage.
As part of the scheme, upgrades will be done on some of the most historic structures in the country, including the Ouse Valley Viaduct, The Balcombe and Clayton Tunnels.