Shin-Kanmon Tunnel

{{Short description|Undersea tunnel in Kanmon Straits, Japan}}

{{refimprove|date=August 2021}}

{{Infobox tunnel

|name = Shin-Kanmon Tunnel

|image = Shin-Kanmon Tunnel Shin-SHimonoseki.JPG

|caption = Tunnel entrance

|line = Sanyō Shinkansen

|location = Honshu–Kyushu

|coordinates =

|system =

|status =

|start =

|end =

|stations =

|opened = March 10, 1975

|close =

|owner =JR West

|operator = JR West

|character = Passenger

|linelength = {{convert|18.713|km|mi|abbr=on}}

|tracklength =

|notrack =2

|gauge = {{RailGauge|1435mm}}

|el =

|speed ={{Convert|300|km/h|mph|abbr=on|round=5}}

|hielevation =

|lowelevation=

|height =

|grade =

|}}

{{Coord|33|57|57.4|N|130|57|47.2|E|region:JP|display=title}}

The {{nihongo|Shin-Kanmon Tunnel|新関門トンネル|shin-kanmon tonneru}} is a {{convert|18.713|km|adj=on}} long undersea railway tunnel under the Kanmon Straits connecting Shin-Shimonoseki Station and Kokura Station.{{Cite web|last=百科事典マイペディア,世界大百科事典内言及|title=新関門トンネルとは|url=https://kotobank.jp/word/%E6%96%B0%E9%96%A2%E9%96%80%E3%83%88%E3%83%B3%E3%83%8D%E3%83%AB-843820|access-date=2021-08-12|website=コトバンク|language=ja}}

At the time of opening in March of 1975, it was the longest railway tunnel in Japan before being overtaken by in 1988 the opening of the Seikan Tunnel. It is also the longest tunnel section on the entire Sanyo/Tokaido Shinkansen line.