A major operation is underway to prevent a terrorist attack on the railnetwork which will be used by the vast majority of people going to the Olympics.

Pick pockets are also at the centre of police activities as an extra one million passengers are expected on the transport system every day of the games.

For the first time many passengers will see armed British Transport Police at our stations and its been revealed extra anti-terror dogs have been trained and will be on patrol.

The man leading the transport policing operation is BTP Deputy Chief Constable Steve Thomas.

He says the biggest threat remains "terrorism and people who want to steal from others." But he says "measures are in place to keep passengers safe." The British Transport Police (BTP) will deploy a record 1,000 officers tothe games in the transport system in London and at other venues including the cycling in Surrey, rowing in Eaton Dorney and the sailing at Weymouth.

Since May some BTP officers have been trained to carry guns like at our airports. While this has not been done for the Olympics it will be the first time many passengers can expect to see armed transport officers. They are seen as part of the anti-terror threat and to measure members of the public.

They will also play a crucial role in keeping the network on the move during disruption. They will do all they can to get rail engineers to areas where there may be disruption to clear it. BTP say they have spent years planning for the games and they want people to have a good time.

BTP is asking people to: Be alert and report anything like unattended bags. Keep personal possessions safe. Allow extra time for travel as some queuing is inevitable. Prepare for the weather and take water with you. Make arrangements where to meet friends if you get lost.