Witness of Truth: The Railway Murders is a British television docudrama, first broadcast on 11 December 2001, that dramatises the crimes committed by John Duffy and David Mulcahy, commonly known as the Railway Rapists or Railway Killers. The film, produced and directed by Bren Simson, is narrated by Lindsay Duncan, who provides additional details of the crimes, some of which are not dramatised in the film. Huw Higginson and Nicholas Marchie were cast as Mulcahy and Duffy respectively, with Steve Chaplin and Tat Whalley portraying teenage versions of the pair.