What is a deadman switch or pedal?

• A. A device used to automatically stop the train without operator input.
• B. A safety device requiring continuous operator input to keep the train moving.
• C. A device for adjusting signals.
• D. A device to detach cars.

Answer: (B)

A deadman switch is a safety control that requires the operator to continuously provide input to keep the train moving. If the operator releases the control or becomes unable to respond, the train automatically slows and stops, preventing unattended or unsafe movement. This keeps the operator engaged and ensures immediate braking if they can’t respond.

It’s not a device for adjusting signals, nor for detaching cars, and it isn’t something that makes the train stop automatically without any operator input. The key idea is continuous input from the operator to maintain movement.