Font Size

100% 150% 200%

Background Colour

Default Contrast
Close Reset


Back to search

A tunnel running under a river or a hillside through which a railway line runs.

Related Terms

Term Note
AIR SHAFT An artificial ventilation shaft.
TUNNEL An artificial underground channel. Use specific type where known.
VENTILATION SHAFT A shaft designed to allow for the adequate circulation of air through an underground structure. Linked Data resource