What is required before any movement can be made after a train has been granted "track and time"?

When "track and time" is granted to a train, it is essential that acknowledgment must be received before any movement can be initiated. This step ensures that all parties involved are aware of the granted permission and understand the current situation regarding the track and time allotment. It minimizes the risk of miscommunication that could lead to dangerous situations on the railroad.

The requirement for acknowledgment is critical in facilitating coordinated efforts among dispatchers, train crews, and signal operators, thereby enhancing safety. Acknowledgment indicates that the crew has confirmed receipt of the track and time clearance and is prepared to proceed, mitigating the possibility of misunderstandings regarding the authority to move.

In contrast, while confirming permission from crew members, visually inspecting the route for obstacles, and checking signals can be important practices in different contexts, they do not specifically address the critical requirement of ensuring that acknowledgment of the granted track and time has been received.