In Manual Block signal system territory, how can track cars enter the main track?

In a Manual Block signal system territory, track cars are required to adhere to specific protocols when entering the main track. The correct approach for track cars to enter the main track is through road crossings, but this entry must be authorized by the dispatcher. This reflects strict operational safety measures in place to prevent conflicts with train movements and ensure the safety of both the crew operating the track car and any oncoming trains. The dispatcher has visibility and control over train movements in this territory, enabling them to acknowledge and prioritize the safe entry of track cars at designated road crossings.

Other options suggest less regulated methods of entry, which do not align with the safety protocols established by the operating rules. Entering at any point as long as authorized or at random block signals could lead to safety issues, as those points may lack the necessary operational oversight to prevent accidents. High-speed crossings do not provide an appropriate context for the controlled entry of track cars either, further reinforcing that dispatcher authorization at road crossings is the safest and most regulated method.