What brake pipe reduction is needed to trigger the Accelerated Service Release feature?

The Accelerated Service Release feature is designed to optimize train handling by allowing for a quicker reapplication of air brakes after a service reduction. To activate this feature, a brake pipe reduction of 10 psi or greater is required. This specific reduction level is crucial because it ensures sufficient air pressure is released from the brake pipe to facilitate a rapid response in brake systems, enabling the train to regain braking control promptly.

A smaller reduction would not provide the necessary signal to activate this feature, while a larger reduction is not required and could potentially lead to unnecessary complications in managing the train's brake system. Thus, the requirement of a 10 psi or greater brake pipe reduction effectively balances the need for prompt service resumption without overcomplicating the braking process.