Main train operating companies that served London relied on diesel traction as their routes served areas that electrification had yet to reach. We take a circular tour around London, watching DMUs and HSTs in action. Featuring passenger operations in and around the capital city, London. Trains include Southern Railway Class 170s and 171s. South West Trains Class 159s and 170s. First Great Westerns HSTs and Thames Turbos out of Paddington. We look at diesel services on the Chiltern, Midland and East Coast main lines. We see the open access operators including Wrexham and Shropshire, Grand Central and Hull trains. One Railway Class 170s and Silverlink Class 150s also feature. Finally we take a short look at some special charters that have passed through London in the last couple of years including the Orient Express, Blue Pullman, Hastings DEMU 1001 and finally D1015 Western Champion. Also in this programme are HSTs operated by numerous operating train companies. Some of the locations featured include London Bridge, East Croydon and Paddington. For added interest rail tours around the area are also featured.