Railroad signals are visual indicators used to communicate important information to train operators. They help ensure safe train operations by conveying messages about track conditions, speed limits, and the presence of other trains. Signals can be found along the tracks and are typically illuminated or use colored lights to indicate different statuses. There are various types of railroad signals, including stop signals, caution signals, and clear signals. Each type has specific meanings, helping train crews make informed decisions while navigating the rail network. Proper understanding of these signals is crucial for maintaining safety and efficiency in the railroad system.