Revenue protection manager Chris co-ordinates a major operation to clamp down on fare evasion at Clapham station, where more than 4,000 notices for ticketless travel were issued in 2024. A young law student pleads his case to Sam after getting caught without a valid ticket, while Jack deals with a frustrated single mum with no ticket at all. On the trains, Nathan and Dan clamp down on the epidemic of ticketless travel between unstaffed stations and challenge a young fare dodger caught hiding in the toilet.

At Vauxhall, revenue protection officers from South Western Railway are involved in a major sting operation which prompts an investigation into fraud going back seven months. A lady is stopped using a half-price ticket bought with a Job Centre Plus discount card which she doesn't have. At Southampton, Spencer is on high alert after claims that two young women who push through the barriers are being abusive and are trying to travel for free. At Waterloo Harry takes on tailgaters and the abuse of half-price child tickets at half term. And two newly trained recruits are on the Weymouth to London line - a route notorious for fare dodgers.