Neutrino factories: Accelerator facilities

This paper describes the accelerator facilities needed for a neutrino facto ry. Such facilities consist of several modules: A proton source, a proton t arget, followed by muon capture, muon cooling, muon acceleration and muon s torage. The status of these modules is presented. The conclusions contain a discussion of the status of neutrino factory studies, and a programme for future research and development.