What ITEM is referenced to determine the number of operative brakes in a train?

The reference to SSI, Item 2-F for determining the number of operative brakes in a train is correct because this specific item provides crucial information about the functioning and status of the air brake systems. It typically includes details that help in verifying which brakes are operational and the overall braking capacity of the train. Understanding this is vital for ensuring safety and compliance with operational standards, as effective braking is essential for safe train handling, especially during stops and in emergencies.

The other items do not pertain to the verification of operative brakes, which is why they are not relevant for this purpose. Instead, they may cover different operational aspects or systems related to train performance or safety measures that lack the specific focus on brake functionality provided in Item 2-F. Thus, utilizing the correct item is essential for maintaining the safety and operational readiness of the train.