What should the independent brake valve handle be set to when adding helpers to the rear of a train?

When adding helpers to the rear of a train, the independent brake valve handle should be set to the RELEASE position. This allows the air brakes on the train to deactivate, which is important for several reasons.

Firstly, releasing the brakes ensures that the train can move freely as the helpers are coupled onto the rear. If the brakes were applied during the coupling process, it could cause excessive strain on the couplings or even damage the brake systems on either the train or the helpers.

Additionally, by releasing the brakes, it helps to prevent any potential issues with the brake system when the helpers are engaged. This can facilitate smoother coupling operations and ensure that all units are properly synchronized when the train resumes movement. The goal is to create a safe and efficient coupling environment, minimizing the risk of accidents or equipment damage.

In contrast, positions like APPLY or STOP would keep the brakes engaged, which is not advisable when making couplings, and COAST might not provide the control needed during such an operation. This is why releasing the brakes is essential in this context.