The construction of the longest and the deepest railroad tunnel was finished in Europe. The tunnel runs through the Alps and links the north and south of Europe. The length of the tunnel is 57 kilometres. It runs straight from beginning to end. It will allow passenger trains to travel more quickly through the mountains. Modern technologies ensure safety and security when the trains go through the tunnel. The great project started in 2009 and it took 17 years to complete. It is considered to be one of the most amazing engineering constructions in Europe.