What is required when switching at an interlocking and making movements against the current of traffic?

When switching at an interlocking and making movements against the current of traffic, it is essential to obtain permission from the block operator. This is necessary because interlockings are critical areas where trains can change routes and switch tracks safely while maintaining the integrity of signal and train movements. The block operator is responsible for the control of train movements and ensuring that the switches are correctly aligned and signals are clear for safe operation.

Permission from the block operator guarantees that the necessary protocols are followed to prevent unsafe conditions, such as conflicting movements or misaligned track switches. This procedure ensures that all train movements are coordinated and that the safety of the rail operations is maintained, particularly in situations where there may be oncoming traffic or other trains operating in the area.

Understanding this process is vital for ensuring proper communication among crew members and maintaining the high safety standards required in rail operations.