What is the purpose of the dead-man switch on a TRAX operator's control equipment?

• A. It requires the operator to apply continuous control; if released, the train automatically slows and stops.
• B. It signals the dispatcher of operator status.
• C. It activates emergency braking after a delay.
• D. It is used to power the door opening sequence.

Answer: (A)

The main idea here is that the dead-man switch is a safety device that requires the operator to be actively controlling the train. As long as the operator keeps applying pressure or otherwise engaging the control, the train continues moving. If the operator releases the switch, the system detects that the operator is no longer in control, and the train automatically slows and stops to prevent an unsafe situation.

This isn’t about signaling the dispatcher or about a delayed emergency brake. It’s a local safety feature tied to the operator’s presence and attention. The doors are controlled separately and aren’t invoked by this switch.