Which of the following is NOT a requirement when issuing track warrants?

When issuing track warrants, one of the fundamental principles is to ensure the safety and effective management of train movements. The specific requirement that all trains within the limits must move at high speed is not a necessity in this context. In fact, train speeds must be governed by safety protocols, circumstances, and specific instructions relevant to track and environmental conditions.

Issuing track warrants focuses on establishing clear communication and documented guidelines for where trains are permitted to operate. This includes authorizing trains to occupy the main track and recording specific locations of movement, which are key to ensuring that all trains can operate safely and efficiently within the designated limits. Additionally, restrictions may be necessary when considering particular crossroad interactions to ensure the safety of both train operations and any potential cross traffic. Therefore, the notion that high speed is a requirement contradicts the primary objectives of track warrant issuance, which prioritize safety over speed.