John Duffy and David Mulcahy

John Francis Duffy (born 1958) and David Mulcahy (born 1959) are two British serial rapists and serial killers who together attacked numerous women and children at railway stations in southern England during the 1980s.

Their crimes are often referred to as "the railway murders", and they are often referred to as the "railway rapists" or the "railway killers"; Duffy, once identified, was referred to in the press as the "railway murderer" or "laser eyes".

Duffy was convicted of two murders and four rapes, although he was acquitted of a further rape and killing. He was given a minimum tariff of 30 years by the judge, later extended to a whole life tariff by the Home Secretary. Mulcahy was convicted of three counts of murder and seven counts of rape and was given three life sentences, with a 30-year recommendation, and 24 years' imprisonment for each full rape offence. Duffy was later sentenced to 12 years' imprisonment for each of seven full rape offences he had confessed to (although he was already serving a full life sentence).