The official Olympic train service will depart from Kent for the first time this morning.
Kent's high speed services are being used to take hundreds of thousands of passengers from St Pancras to the Olympic park.
But for thousands in Kent it means they will lose regular high speed services to London.
Southeastern say they'll put on extra carriages on slower trains to the capital.
Rail passengers faced two hour delays on the Paddington mainline after a major security alert at Bristol Parkway.Services to the Thames Valley, including Reading, Swindon and Didcot were disrupted.
The incident lasted almost two hours with a train and the station evacuated. Services were halted.
A major security alert is tonight in operation on the Great Western mainline.The train at the centre of the alert is the 3.28pm Swansea to London and due to Stop at Swindon and Reading.
It is understood an unattended bag was spotted and the alarm raised.All passengers have been evacuated from the train at Bristol Parkway and the station has also been evacuated.Anti-terror police have been called to the scene.
Passengers were told to leave everything on the train and evacuate.Trains are not stopping at the station and delays on the Paddington line are expected for some time.The situation is ongoing.
A train heading to Reading and London from Wales has tonight been evacuated at Bristol. Meridian understands two unattended bags were spotted by passengers. Both the train and Bristol Parkway Station have been evacuated . Sniffer dogs are at the scene.
The train was travelling from Cardiff. The call to the police was just after 1700. The train was due at Reading around 1830.
Flash flooding in Sway has seen the cancellation of all services between Bournemouth and Southampton. Meridian understands that the water overran the train line which has seen all services replaced by buses.
Services are returning to normal after a pedestrian was struck by a high speed train in northern France. Eurostar departures to and from Kent and London were delayed by more than an hour while investigations into the accident took place.
There are delays of up to one hour on Eurostar trains at St Pancras International, at Ebbsfleet International and at Ashford International in Kent after a person was hit by train in France.
Reading East MP Rob Wilson has criticised First Great Western after it reduced carriage numbers on rush hour trains to seven. A spokesman said it's aiming to increase the length of all its high speed trains to eight carriages by the end of July to ease the overcrowding crisis.