Despite being the longest train tunnel in the world, alternatives like the Seikan Tunnel in Japan's Tsugaru Strait and the Channel Tunnel connecting the UK and France offer quicker routes.

The Seikan Tunnel in Japan is the world's current longest undersea tunnel used by bullet trains. Spanning 53.85 kilometers (33.46 miles), it includes a 23.3-kilometer (14.5-mile) section beneath ...

Channel Tunnel between England and France and the present record-holder, Japan's 54-kilometer-long (33.6-mile-long) Seikan Tunnel. It will stand alone on the engineering front as well. Where its ...

A separate system grouts the pieces together. With its official opening, the GBT has surpassed Japan's 53.9-kilometre Seikan tunnel as the world's longest train tunnel. The 50.5-kilometre Channel ...