貫通制軔

貫通制軔為一種制動方式 ，旨在作為使整組列車 減速或停止的主要手段。

要使列車停止需要強勁的制軔力，因此列車中的個別車輛都配備有氣軔系統 ，好讓整組列車所有車輛上的軔機有辦法同步緊軔。

操作鐵路動力車輛 上的貫通司軔閥 以透過此種方式制軔。施加貫通司軔閥將使軔管 中的壓力被釋放至大氣中，間接驅使儲於輔助風缸 內的空氣填充軔缸 ，以其推送軔塊 向車輪施壓，從而使列車緊軔。

The same control device is used to release train brakes. Release functions by the brake pipe getting pressurized by main reservoir . The auxiliary reservoirs then recharge from the pipe and no longer feed the brake cylinders, depressing the brake shoes from the wheels and no longer braking the train.

貫通軔機通常透過位於動力車輛上的貫通軔機司軔閥（自閥）手柄操作。如果一組列車中有多架動力車輛，壓力將受到「自動保壓」式司軔閥或是位於更高緊軔位的司軔閥主導。

Train brake should be used when a train contains cars . If the train only contains motorized vehicles, whether it a single one, or many in multiple-unit configuration , using the independent brake is a more responsive option.

To aid the train brakes and prevent brake shoes from overheating , some motorized vehicles are equipped with dynamic brakes , too.