What happens after a full service brake pipe reduction is made?

After a full service brake pipe reduction is made, the brake cylinder pressure reaches a level determined by the amount of reduction and the system's design. Once this pressure is established, further service brake reductions will not lead to an increase in brake cylinder pressure. This is due to the characteristics of the air brake system, where the brake cylinder pressure is controlled by the amount of brake pipe reduction and the configuration of the system.

In practical terms, after a full service brake pipe reduction, the system is designed to stabilize at that set pressure, and any subsequent adjustments to the brake pipe pressure will only maintain or release the existing pressure rather than increase it. This is a crucial operational understanding for train handling, as it informs how conductors and engineers manage braking effectively and safely after a full service reduction has occurred.