Lost power between Didcot and Paddington causes problems. A truck strikes a railway bridge. A woman has a cardiac arrest at a ticket barrier. In the wake of the Salisbury nerve agent scare, containers of an unknown chemical found on board a train.

A fatality on the line at Slough station means closing the station and the line, leading to a standstill at Paddington. A Thai pricess and her entourage are eager for a tour of the station. Thieves have robbed a scrapyard and used the railway track to get away.