An intruder puts his life at risk by running along the tracks. Engineers work around the clock to install new cables at Newbury. Ticket machine refurbishments do not go to plan.

The British Transport Police mount a special operation to stop criminals who are running drugs out of the capital. A crack has been discovered on a rail joint at Acton East - if it snaps, it could be fatal. At Paddington, a passenger has fallen between the train and the platform, while at Bristol, a BTP officer must talk down a potentially suicidal woman.