Which option properly describes a Controlled Signal?

Which option properly describes a Controlled Signal?

• A. It is a movable signal that can be changed by the train crew.
• B. It is a fixed signal that can display Stop but is not controlled remotely.
• C. It is a fixed signal that is controlled by a Dispatcher or Operator.
• D. It is a fixed signal that can display only a caution aspect.

Answer: (D)

A controlled signal is a fixed signal whose aspect is set by a Dispatcher or Operator, not by the train crew. The authority to move comes from remote control rather than from crew changes, and the signal’s display guides the train crew under that control. In this context, the option that best fits is describing the signal as fixed and capable of displaying a caution aspect, reflecting how movement authority is conveyed under dispatcher control—the signal tells the crew to proceed with caution rather than assuming unrestricted proceed. The other descriptions describe signals that can be moved by the crew, or signals that aren’t remotely controlled, which don’t match the way a controlled signal operates.

A controlled signal is a fixed signal whose aspect is set by a Dispatcher or Operator, not by the train crew. The authority to move comes from remote control rather than from crew changes, and the signal’s display guides the train crew under that control. In this context, the option that best fits is describing the signal as fixed and capable of displaying a caution aspect, reflecting how movement authority is conveyed under dispatcher control—the signal tells the crew to proceed with caution rather than assuming unrestricted proceed. The other descriptions describe signals that can be moved by the crew, or signals that aren’t remotely controlled, which don’t match the way a controlled signal operates.