Which light indicates that a local handbrake is applied?

The bottom red light is used as an indicator that a local handbrake has been applied. In the context of train operations, this light serves a crucial safety function. It alerts the crew that the handbrake is engaged, thereby signaling that the train is restricted from moving due to the application of the handbrake. This information is vital for ensuring the safety of operations, particularly when the train is stationary and must not inadvertently roll.

Other light indicators, such as the top green light, center amber light, and top yellow light, have different meanings related to various statuses or conditions of the train system, but they do not specifically indicate that the local handbrake is applied. Understanding the function of these lights is essential for proper train management and safety protocols.