English Dictionary

sand drag

noun

(rail transport, UK) a pile of sand or earth at the end of a siding or bay platform, intended to stop trains that overrun or pass through trap points set for a siding.

The sand drag is used to slow down trains in case of emergency.

意味（1）

(rail transport, UK) a pile of sand or earth at the end of a siding or bay platform, intended to stop trains that overrun or pass through trap points set for a siding.

Sand drags are usually laid in as an extension of trap sidings or of lines from catch-points. The rails are boxed in for some distance on either side, and the box is filled with sand, or, preferably, coarse gravel, the intention being, as the name implies, that the sand will act as a drag, and help bring the runaway train or vehicles to rest before they derail and cause serious damage.