 First proposed during 1975, construction of the tunnel commenced during 1991 and was officially completed on 19 November 1999, ahead of schedule.In the first year alone, roughly 280,000 vehicles were recorded as having used the tunnel; since them, its usage has risen to around 450,000 vehicles per year.At in length, the Vereina Tunnel is the longest tunnel on the Swiss Rhaetian Railway (RhB) network as well as the world's longest metre-gauge railway tunnel.