Which method is required when a train does not meet the AFM requirements of 60 CFM?

The Brake Pipe Leakage Method is essential in situations where a train does not meet the Air Flow Method (AFM) requirements of 60 cubic feet per minute (CFM). This method is focused on evaluating the integrity and functionality of the air brake system by checking for any leakage in the brake pipe that could affect the braking performance. If the CFM requirement is not satisfied, it indicates that there might be issues with the air distribution, and verifying the leakage is critical to ensure the air brakes can operate efficiently and safely. By conducting this method, personnel can identify potential failures within the air brake system that need immediate attention, thus ensuring compliance with safety regulations and operational standards.

The other methods discussed do not specifically address the issue of insufficient air flow; instead, they may serve different purposes that do not directly substitute for the required assessment in this scenario.