Train signals are visual indicators used to communicate important information to train operators. These signals can be lights, flags, or signs that convey messages about track conditions, speed limits, and whether it is safe to proceed. They help ensure the safe and efficient movement of trains along the railway network. The most common type of train signal is the traffic light system, which uses colored lights to indicate different actions. A green light typically means "go," while a red light signals "stop." Understanding these signals is crucial for maintaining safety in the railway system and preventing accidents.