A railroad plough is a rail vehicle which supports an immensely strong, hook-shaped plough. It is used for destruction of sleepers in warfare, as part of a scorched earth policy, so that the track becomes unusable for the enemy. In use, the plough is lowered to rip up the middle of the track as it is hauled along by a locomotive. This action breaks the wooden ties (sleepers) which forces the steel rails out of alignment, making the line impassable by later rail vehicles. Bridges and signalling equipment also suffer serious damage.