What is the most effective way for train operators to bring a moving subway train to an emergency stop?

Bringing a moving subway train to an emergency stop requires a precise and specific action to ensure safety and effectiveness. Removing the hand from the master controller handle is the most effective response in an emergency situation because it immediately disengages the propulsion system. This action stops the train from accelerating further and allows for a controlled deceleration.

When the hand is lifted from the master controller, the train operator is effectively signaling the braking system to engage, which is a necessary step for bringing the train to a stop. This maneuver is crucial during emergencies because it allows the operator to expedite the process of halting the train while also preparing to engage the emergency braking system if needed.

While pulling the emergency brake lever is an option, doing so can introduce complications or delay if the operator has not first disengaged the propulsion. Other responses like honking the train horn or activating hazard lights do not contribute to stopping the train and are meant for communication or indication rather than bringing the train to a stop. Therefore, understanding the sequence of actions and the implications of each is essential for effective train operation during emergencies.