What is required after locking a switch or derail?

After locking a switch or derail, testing the lock to ensure it is secured is essential for safety and operational integrity. This step confirms that the locking mechanism is functioning properly, preventing any accidental movement of the switch or derail while trains are in transit. A reliable lock ensures that the alignment is maintained according to the established track work, avoiding any potential derailments or operational incidents.

This procedure is crucial not just for the safety of the train and crew, but also for maintaining the safety protocols of the railway system as a whole. Properly locking and verifying the lock helps uphold the reliability of the rail network and reinforces the importance of adherence to safety protocols.