linea ferrea 21
It is called via railway to the part of the railway infrastructure formed by all the elements that make up the site through which the trains travel. Railways are the essential element of the railway infrastructure and consist, essentially, of Rails supported on sleepers which are arranged within a layer of ballast. For its construction is necessary movement of soils and complementary works ( bridges, culverts, retaining walls, drainage, etc. ).Completes the basic 40-signalling systems infrastructure; before manuals and now automatic ) and, in the case of lines electrified, with electrical lines supplying power to the locomotives.