What are the two main types of train signals?

Answer: B — Positive signals and negative signals

The two main types of train signals are categorized as positive signals and negative signals. Positive signals indicate that a train can proceed and typically show a clear aspect that allows the operation of the train without restrictions. These are crucial for ensuring the safe movement of trains and may include aspects that denote speed limits or track conditions. Negative signals, on the other hand, indicate that movement is not permitted, such as stop signals. These signals are essential for preventing accidents by clearly communicating to train crews that they must halt their train before reaching the signal or adhere to the prescribed restrictions. In railway operations, the distinction between these two types is fundamental for maintaining safety protocols and ensuring efficient train dispatching. Proper understanding and recognition of these signals are vital for train crews to navigate the rail network safely and effectively.