The radio warning system Minimel Lynx is an innovative development for automated track workers and goods protection on the open rail. The warning system detects approaching trains and warns construction workers on worksites with optical and acoustical signals. The trains are counted either automatically using treadles, train detector or manually by the look-out operator using the radio hand switch (HSF-L). The train detection is processed at the central unit and a warning is automatically issued to all warning devices. It is a modular system which can be customised specifi cally for each application.