List of longest railway tunnelsThis page presents a list of the longest railway tunnels of the world, excluding subway tunnel sections. World's longest railway tunnels in useWorld's longest railway tunnels under constructionSee alsoWikimedia Commons has media related to Tunnel.
Water supply networkA water supply network or water supply system is a system of engineered hydrologic and hydraulic components that provide water supply. A water supply system typically includes the following: A drainage basin (see water purification – sources of drinking water)A raw water collection point (above or below ground) where the water accumulates, such as a lake, a river, or groundwater from an underground aquifer.
TunnelA tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at various points along the length. A pipeline differs significantly from a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.*As an Amazon Associate I earn from qualifying purchases.