railroad
Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in tracks. In contrast to road transport, where the vehicles run on a pre ...
tunnel
A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube cons ...
in
Gunma
is a prefecture of Japan located in the Kantō region of Honshu. Gunma Prefecture has a population of 1,937,626 (1 October 2019) and has a geographic area of 6,362 km2 (2,456 sq mi). Gunma Prefecture borders Niigata Prefecture and Fukushim ...
and
Niigata Prefecture
is a prefecture in the Chūbu region of Honshu of Japan. Niigata Prefecture has a population of 2,227,496 (1 July 2019) and is the fifth-largest prefecture of Japan by geographic area at . Niigata Prefecture borders Toyama Prefecture and N ...
JR East
The is a major passenger railway company in Japan and is the largest of the seven Japan Railways Group companies. The company name is officially abbreviated as JR-EAST or JR East in English, and as in Japanese. The company's headquarters ar ...
Jōetsu Line
The is a major railway line in Japan, owned by the East Japan Railway Company (JR East). It connects Takasaki Station in Gunma Prefecture with Miyauchi Station in Niigata Prefecture, linking the northwestern Kanto region and the Sea of Japan c ...
. The name originates from the Shimizu mountain pass nearby. There are three tunnels near each other, which are the Shimizu Tunnel, the Shin-Shimizu Tunnel, and the Dai-Shimizu Tunnel.
Shimizu tunnel
The Shimizu tunnel is the oldest of the three, opened in 1931 after nine years of construction. The length of the tunnel is 9,702 m, and has a
single track
Single may refer to:
Arts, entertainment, and media
* Single (music), a song release
Songs
* "Single" (Natasha Bedingfield song), 2004
* "Single" (New Kids on the Block and Ne-Yo song), 2008
* "Single" (William Wei song), 2016
* "Single", by ...
. Because of technical difficulties at the time, a
spiral
In mathematics, a spiral is a curve which emanates from a point, moving farther away as it revolves around the point.
Helices
Two major definitions of "spiral" in the American Heritage Dictionary are:Website on Shimizu tunnel
The construction improved the journey time between Niigata and
Tokyo
Tokyo (; ja, 東京, , ), officially the Tokyo Metropolis ( ja, 東京都, label=none, ), is the capital and List of cities in Japan, largest city of Japan. Formerly known as Edo, its metropolitan area () is the most populous in the world, ...
, decreasing it by 4 hours since trains no longer needed to go through the
Usui Pass
The is a mountain pass that lies between Nagano and Gunma prefecture in Japan. It has served as one of the major transportation routes in central Japan since at least the eighth century.
Road
The pass on the ancient Tōsandō highway was ...
steam locomotives
A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomo ...
, the tracks in and around the tunnel were electrified from the beginning.
Shin-Shimizu tunnel
The Shin-Shimizu tunnel was made in 1967 to make the line
double track
A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track.
Overview
In the earliest days of railways in the United Kingdom, most lin ...
, because of a high demand of transportation on the Joetsu line. The tunnel is 13,500 m long.