What defines a Controlled Signal?

What defines a Controlled Signal?

• A. A fixed signal that is never controlled by a Dispatcher.
• B. A moving signal controlled by the train crew.
• C. A fixed signal, capable of displaying Stop indication, that is controlled by a Dispatcher or Operator.
• D. A sign indicating speed reduction.

Answer: (C)

A Controlled Signal is a fixed signal that can display a Stop indication and is controlled by a Dispatcher or Operator. This means the authority to proceed through the signal comes from the dispatcher or operator, not from the train crew, and the signal itself is stationary and capable of showing a Stop aspect. That combination—fixed location, Stop-capable, and dispatcher/operator control—is what defines a Controlled Signal. The other ideas don’t fit: a moving signal controlled by the train crew isn’t a fixed, dispatcher-controlled device; a sign indicating speed reduction isn’t a signal at all in terms of controlling train movements; and a fixed signal that’s never controlled by a Dispatcher doesn’t meet the “controlled by a Dispatcher or Operator” aspect.

A Controlled Signal is a fixed signal that can display a Stop indication and is controlled by a Dispatcher or Operator. This means the authority to proceed through the signal comes from the dispatcher or operator, not from the train crew, and the signal itself is stationary and capable of showing a Stop aspect. That combination—fixed location, Stop-capable, and dispatcher/operator control—is what defines a Controlled Signal.

The other ideas don’t fit: a moving signal controlled by the train crew isn’t a fixed, dispatcher-controlled device; a sign indicating speed reduction isn’t a signal at all in terms of controlling train movements; and a fixed signal that’s never controlled by a Dispatcher doesn’t meet the “controlled by a Dispatcher or Operator” aspect.