semi-automatic signal
Signal 176.3 on the approach to Wingello, showing a yellow aspect. It can show steady yellow "caution" indication as well as pulsating yellow "medium" (preliminary caution/warning) indication. There are a couple of sidings for track vehicle and emergency use plus an emergency crossover at Wingello. Normally 176.3 operates as a permissive, automatic signal (block signal), but when the electric release is taken at Wingello to unlock points there, 176.3 becomes an absolute home signal. To indicate when it is working as an automatic signal, it displays an "A" light below the main head. When the release at Wingello is taken and it becomes in effect a home signal protecting points, the A light is extinguished. It then cannot be passed at stop without authority.
semi-automatic signal
Signal 176.3 on the approach to Wingello, showing a yellow aspect. It can show steady yellow "caution" indication as well as pulsating yellow "medium" (preliminary caution/warning) indication. There are a couple of sidings for track vehicle and emergency use plus an emergency crossover at Wingello. Normally 176.3 operates as a permissive, automatic signal (block signal), but when the electric release is taken at Wingello to unlock points there, 176.3 becomes an absolute home signal. To indicate when it is working as an automatic signal, it displays an "A" light below the main head. When the release at Wingello is taken and it becomes in effect a home signal protecting points, the A light is extinguished. It then cannot be passed at stop without authority.