Why Are There Stones Along Railway Tracks?

Описание: RAILWAY TRACK

A railway track (British English and UIC terminology) or railroad track (American English), also known as permanent way or simply track, is the structure on a railway or railroad consisting of the rails, fasteners, railroad ties (sleepers, British English) and ballast (or slab track), plus the underlying subgrade.

Track ballast forms the trackbed upon which railroad ties (sleepers) are laid. It is packed between, below, and around the ties. It is used to bear the load from the railroad ties, to facilitate drainage of water, and also to keep down vegetation that might interfere with the track structure.Ballast also holds the track in place as the trains roll over it.

Sleepers are the horizontal supports which lie underneath the rails, helping hold them in place. They can be made of wood, concrete or metal. Special fasteners connect the rail to the sleepers.

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