Yulhyeon Tunnel
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The Yulhyeon Tunnel (Korean: 율현터널) is a railway tunnel in South Korea, which opened in 9 December 2016, and is currently the world's fourth longest railway tunnel at 50.3 kilometres (31.3 mi). The tunnel, which consists of a double-track tube, is part of the 61.1-kilometre (38.0 mi) Suseo–Pyeongtaek high-speed railway and GTX-A that connects Suseo station in the southeastern part of Seoul with the Gyeongbu high-speed railway. The threading into the older high-speed line is in the south of the city of Pyeongtaek. The tunnel itself takes up about 82% of the total new line. The Yulhyeon Tunnel was built using the New Austrian tunnelling method (NATM) and is designed for a maximum speed of 300 km/h (186 mph). The average cruising speed is about 240 km/h (149 mph) due to the intermediate stop at Dongtan Station in the southern part of the tunnel.[1]