What brake pipe reduction is required during short term securement before leaving the equipment?

During short-term securement before leaving the equipment, a 20 lb reduction in the brake pipe is required. This specific reduction helps ensure that the train remains in a safe and stationary position. The 20 lb brake pipe reduction allows for enough brake force to be applied to prevent any unintended movement while not requiring an excessive reduction, which could lead to unnecessary strain on the braking system.

This practice is important for maintaining safety protocols when securing rail equipment, as it balances the need for security with operational efficiency. Other options, such as a full brake pipe reduction or different pound reductions, do not align with the standard operational procedures for short-term securement, as they may lead to either over-application of brakes, risking a potential disturbance in the brake system, or inadequate securement of the equipment.