What is necessary for switching movements at interlockings?

When executing switching movements at interlockings, it's essential to have handling from the block operator. This is critical because the block operator ensures that the movements are carried out safely and in compliance with established procedures.

The block operator is responsible for controlling the signals and switches within the interlocking, ensuring that the routes are set correctly and that any conflicting movements are managed appropriately. This oversight is vital for maintaining safety on the tracks, preventing accidents, and ensuring that all procedures are followed correctly. Proper handling from the block operator also allows for effective communication and coordination between different train movements.

In contrast, while typical signal authorizations can indicate the ability to proceed, they do not by themselves guarantee safe switching at interlockings. Direct contact with other trains is not required for switching movements, as these can occur independently of nearby trains. Finally, GPS systems do not play a role in the switching process at interlockings, where human oversight and established protocols are crucial for operational safety.