You’ll agree with me that man-made railway tunnels and all tunnels, in general, are the most impressive engineering accomplishments by humans. From providing breathtaking experiences to enhancing our ability to travel across the world in the face of natural obstacles such as mountains and large bodies of water.
In this post, we’ll look at the 5 longest railway tunnels in the world.
The 5 longest railway tunnels in the world
- Gotthard Base Tunnel in Switzerland (length 57.1 kilometres)
- Seikan Tunnel in Japan (lenghth 53.9 kilometers)
- Channel Tunnel in France/United Kingdom (length 50.5 kilometres)
- Yulhyeon Tunnel in South Korea (Length 50.3 kilometres)
- Songshan Lake Tunnel in China (length 38.8 kilometres)
1. Gotthard Base Tunnel
The Gotthard Base Tunnel is the longest railway tunnel in the world with a length of 57.1 kilometers. The tunnel also holds other titles. It is the world’s deepest traffic tunnel and the first flat, low-level route through the Alps, Switzerland. Opened in June 2016, the tunnel is part of the New Railway Link through the Alps (NRLA) project. It consists of a huge complex with two single-track tunnels at its core connecting Erstfeld (Uri) with Bodio (Ticino) and passing below Sedrun (Grisons).
The Gotthard Base Tunnel is referred to as a “base tunnel” because it bypasses most of the existing Gotthard railway line. The latter is a winding mountain route opened back in 1882 across the Saint-Gotthard Massif. The existing Gotthard railway line was operating at its capacity before the opening of the GBT.
Unlike the latter, the new base tunnel establishes a direct route usable by high-speed rail and heavy freight trains.
2. Seikan Tunnel
The Seikan Tunnel is a 53.9 km dual-gauge railway tunnel in Japan.
The railway tunnel, which is the second longest in the world, has a 23.3 km portion under the seabed of the Tsugaru Strait. The latter separates Aomori Prefecture on the main Japanese island of Honshu from the northern island of Hokkaido. Its track level is about 100 meters below the seabed and 240 meters below sea level.
Owing to these features, Seikan Tunnel is, therefore, not only the longest railway tunnel but also the second-deepest transport tunnel below sea level. Moreover, it has one of the longest undersea tunnel sections in the world.
The tunnel is part of the Hokkaido Shinkansen standard-gauge railway and the Kaikyō Line narrow-gauge railway of the Hokkaido Railway Company (JR Hokkaido)’s Tsugaru-Kaikyō Line.
3. The Channel Tunnel
The Channel Tunnel is also known as the Chunnel. It is a 50.5-kilometre underwater railway tunnel. It connects Folkestone (Kent, England) and Coquelles (Pas-de-Calais, France) beneath the English Channel at the Strait of Dover. This is reportedly the only fixed link between the island of Great Britain and the European mainland.
At its lowest point, the Channel Tunnel is 75 metres deep below the sea bed and 115 metres below sea level. At 37.9 kilometres the tunnel has the longest underwater section of any tunnel in the world.
The Channel Tunnel, which carries high-speed Eurostar passenger trains, LeShuttle services for road vehicles as well as freight trains, is owned and operated by Getlink, formerly known as “Groupe Eurotunnel”.
4. Yulhyeon Tunnel
Opened in December 2016, this is a double-track railway tunnel in South Korea. It is the world’s fourth-longest railway tunnel at a length of 50.3 kilometres.
The Yulhyeon Tunnel is part of the 61.1-kilometre Suseo–Pyeongtaek high-speed railway. The latter connects Suseo station in the southeastern part of Seoul with the Gyeongbu high-speed railway. The tunnel takes up approximately 82% of the total length of the Suseo–Pyeongtaek high-speed railway.
Noteworthy, the Yulhyeon Tunnel was built using the New Austrian tunnelling method (NATM) and is designed for a maximum speed of 300 km/h. The average cruising speed within the tunnel is 240 km/h or its thereabouts. This is mainly due to the intermediate stop at Dongtan Station in the southern part of the tunnel.
5. Songshan Lake Tunnel
Songshan Lake Tunnel is the 5th longest railway tunnel in the world in addition to the longest of its kind in China. It spans a total of over 35 kilometres across that Dongguan Province and its construction was completed back in 2016.
The tunnel is part of the Dongguan–Huizhou intercity railway, which is also known as the Guanhui intercity railway as well as the Guanhui City Railway. The latter is a regional railway in Guangdong Province, China. It connects the cities of Dongguan and Huizhou in the Pearl River Delta (PRD).
