The following are the longest railway tunnels in the world
Gotthard Base Tunnel
Inaugurated in June 2016, Gotthard Base Tunnel (GBT) is the world’s longest tunnel. Located in Switzerland, the 57.1km long tunnel carves its way through the Alps. Construction of the tunnel took 17 years at a cost of US $12bn. The Gotthard Base Tunnel provides a quicker, more reliable link between north and south for both people and goods and represents the centrepiece of the New Rail Link through the Alps (NRLA)
Seikan is the oldest railway tunnel among the top 5 railway tunnels in the world having been inaugurated over 30 years ago. Located in Japan, the tunnel is 53.9km long with 23km of it being under water. This makes it the world’s longest undersea tunnel. It connects Honshu and Hokkaido Islands in the north of Japan.
The Channel Tunnel
The Channel railway tunnel connects France to the United Kingdom in Europe. The tunnel was opened by Queen Elizabeth II and President Mitterrand 1994. It was built at a cost of US $11.5bn. The 50.5km tunnel runs between Folkestone, England, and Sangatte (near Calais), France, and is used for both freight and passenger traffic.
The Yulhyeon railway tunnel is part of the Suseo High Speed Railway which connects Suseo Station in Seoul and Pyeongtaek 61.1km to the south in South Korea. Inaugurated in 2015, construction of the The 50.3km tunnel took three and a half years. It accounts for 82 percent of the entire length of the Suseo High Speed Railway, currently under construction.
Lötschberg Base Tunnel
The Lötschberg tunnel is part of Die Neuen Eisenbahn-Alpentransversalen (NEAT) / New Rail Link through the Alps (NRLA) project to shift transit traffic from road to rail in Switzerland. The Tunnel is a 34.57km railway base tunnel on the BLS AG’s Lötschberg line cutting through the Bernese Alps of Switzerland some 400m below the existing Lötschberg Tunnel. It runs between Frutigen, Berne, and Raron, Valais.