重連コック

重連コックは、ほとんどの動力鉄道車両 に装備されている弁で、貫通ブレーキ制御弁 を列車の他の車両から遮断します。この弁は通常、車両の運転台 内の貫通ブレーキ制御装置の下にあります。

The brake cutout valves are there to ensure that, in a train with many motorized vehicles, only one train brake control device is enabled. If there were multiple, conflicts would occur, potentially resulting in dysfunctional brakes and a disaster.

When the train brake is cut out on a vehicle, its control device is no longer functional. However, the vehicle is still able to brake, as controlled by another vehicle's train brake.

The cutout valve only affects the train brake control device, but other brake types, such as independent , can still be used freely.