Automatic warning apparatus for railroad workmen

摘要

The automatic warning device has a monitoring device to measure the intensity of the surrounding sound level and a control producing signals in dynamically corresponding form and intensity in accordance with the monitored sound when a set level is exceeded. The sound of the warning signal, recorded in an electronic component, is radiated via a loudspeaker (12). There may also be at least one flashing light, operated by a sensor device. The light sensor may switch from optical-only to optical and sound signals under dazzling light or when dawn is breaking or sunset is beginning.