What does a lit brake application light indicate on a charged train?

A lit brake application light on a charged train indicates that all air brakes are applied. This light serves as a crucial visual signal to the operator, confirming that the train’s braking system is engaged and that the train is in a state of deceleration or hold.

Understanding the implications of this signal is important for safe train operations. When the light is lit, it is essential for the crew to be aware that the train is not ready to move; instead, it is actively using its air brake system to either slow down or remain stationary.

In contrast, if the brakes were released or the parking brake was engaged, the light would not be illuminated. It’s important for operators to interpret this light correctly to ensure that the train's brake systems are functioning as intended and to avoid any unintended movements. A train that is signaling its brakes are applied indicates to all personnel on board that caution should be exercised, as acceleration or power application is not appropriate until the brakes have been released.