A track circuit failure closes Platform 5 which is used by numerous high-speed trains, British Transport Police are out in force as rival Oxford and Millwall fans use the network, and a young man is seen on CCTV walking dangerously close to the edge of the platform.

The trains to the Cheltenham Races are standing room only, even in first class. Potential flooding at Cowley Bridge could cut off all of Devon from the network. Emma uses thermal imaging to inspect the lines for defects from a helicopter. Mark must evict a Traveller community from Network Rail-owned land.