Which issue is related to operational safety when cars have been off air for more than 24 hours?

When cars have been off air for more than 24 hours, they must undergo an air brake test to ensure operational safety. This requirement is based on safety regulations that underscore the importance of verifying that the air brake system is functioning correctly after an extended period of inactivity. Air brakes rely on a pressurized system to operate effectively, and if cars have been off air for too long, there is a risk that air pressure may drop, leading to potential malfunctions. Conducting an air brake test is essential for ensuring that all braking components are in good working order and that the cars can be safely joined to a train for transport. This test serves to confirm the safe functionality of the braking system and is a critical part of maintaining safety standards in rail operations.