When permission is given to proceed past Stop Signals at interlockings under Line 3, what is required for the switches?

When permission is granted to proceed past Stop Signals at interlockings under Line 3, it is critical that the switches are lined and blocked for the intended route. This requirement ensures that the track configuration is set correctly to safely direct the train onto the appropriate track. Lining the switches means adjusting them to the specific direction that the train will travel, while blocking them provides an additional layer of safety by preventing accidental movement of the switches while the train is in the area.

This attention to switch configuration is vital for maintaining safe operations in interlockings, especially when overriding Stop Signals, which are typically in place to prevent movement until certain conditions are met, such as ensuring tracks are clear and safe for train passage. Other scenarios, such as switches being manually operated or left in their current position, would increase the potential for accidents and violations of safety protocols. Therefore, aligning and blocking the switches is a fundamental procedure that upholds the integrity of the signaling system and enhances operational safety.