简介：　　London 1864. On a Hackney bound train, a guard discovers blood in a first class carriage - and a body on the railway embankment. For the first time, a murder has taken place on Britain's railways. Over a hundred years later, this single documentary for BBC Two uses the first hand testimony of the people involved at the time to explore this unique event and how it provoked a huge public outcry and debate.<br />　　The story quickly became a news sensation as the dangers of the brave new world of the train were laid bare. Over a hundred years later, the witnesses to this story may be long dead but their words survive in court transc<x>ripts, memoirs, letters and vivid journalism. These testimonies are now used to tell the story, taking the documentary deep into the nineteenth century to meet an extraordinary cross section of real-life Victorian London - from the engine driver who found the body to the detective in charge of the investigation. Who killed Mr Briggs?…