In an emergency stop, what should a train operator do with the brake handle?

In an emergency stop situation, the train operator should place the brake handle in the emergency position. This action is designed to maximize the train's braking force, allowing for the quickest possible stop. When the brake handle is moved to the emergency position, the system engages all braking mechanisms effectively, overcoming the usual parameters of the braking system to ensure a rapid deceleration.

Moving the handle to release or turning it off would disengage the brakes, which is the opposite of what is needed in an emergency. Leaving the handle in the normal operating position may not apply the necessary braking force quickly enough to halt the train in time to prevent an incident. Therefore, placing the brake handle in the emergency position is a critical and decisive action that enhances safety during unexpected situations requiring an immediate stop.