After receiving information about incorrect PTC speed readings, what must the Dispatcher do?

The Dispatcher plays a crucial role in ensuring safety and effective communication within rail operations. When faced with incorrect Positive Train Control (PTC) speed readings, the immediate priority is to relay all pertinent information to the appropriate personnel. This step is vital as it ensures that those who need to know about the issue, such as safety managers, signal maintainers, or train crews, are quickly informed and can take necessary actions to mitigate any risks associated with the incorrect readings.

This action not only promotes a proactive approach in addressing the situation but also enhances overall safety by making sure that all involved parties have access to the same information, which is essential for decision-making. It establishes a clear line of communication which is fundamental in managing any irregularities in train operations effectively.

The other choices do not emphasize the immediate need for accurate communication with relevant personnel, which is paramount in railway operations to maintain safety and operational integrity.