railway signals
Train traffic lights
Railway signals are visual or auditory devices that communicate instructions to train operators—indicating whether to stop, proceed, or reduce speed.
Traditional signals use colored lights, semaphore arms, or flags; modern systems may transmit directly to cab displays.
The railway signals ahead showed red, forcing us to wait.
- semaphoreFlag-based signaling system
- redPrimary color, warm
- interlockingEngaging by overlap
- lanternEnclosed portable light
- leverPivoting bar for lifting
bell · light · green · all clear · flag · telegraph · danger ahead · arm · signal tower · aspect · mechanical · switch · relay · yellow · cab · train driver · stop · locomotive