What must a train obtain before passing a controlled signal displaying a Stop indication to enter track permit limits?

Before a train can pass a controlled signal that is displaying a Stop indication to enter track permit limits, it is essential to obtain authority from the control operator. This step is crucial because controlled signals are designed to dictate the movement of trains on the railway, ensuring safety and proper coordination of train operations.

When a signal displays a Stop indication, it indicates that the train must not proceed without first gaining the necessary clearance and authority from the control operator. This authority is typically formalized, and it helps to guarantee that the track ahead is clear and safe for the train to enter, thereby preventing potential accidents or conflicts with other trains or work crews in the area.

In contrast, other options do not provide the proper framework for safe train operations. For instance, the notion that no authority is needed fails to address the safety protocols in place. Likewise, simply obtaining permission from any crew member lacks the required operational authority and could lead to unauthorized movements. Lastly, while the track dispatcher holds an important operational role, the specific authority to bypass a controlled signal comes directly from the control operator, making this distinction vital for maintaining safe rail operations.