This guidance covers rail track used underground in mines by locomotive and rope-haulage systems, to transport people, equipment, material supplies and minerals. This guidance is aimed at engineers, technicians and purpose-trained personnel who have duties to select, install, maintain, inspect and deal with trackwork at mines. It is not intended to provide guidance for manufacturers of rail track. It is also relevant to underground rail track in coal mines, miscellaneous mines and tourist mines. The guidance may be of use to other sectors outside the mining industry that use narrow-gauge rail track, such as the tunnelling sector and narrow-gauge railway operators.