Sendai Subway Namboku Line

{{short description|Metro line in Sendai, Japan}}

{{Infobox rail line

| box_width =

| name = Sendai Subway Namboku Line

| color = {{Ja-rail-color/Sendai|N|#}}

| logo =

| logo_width = 180px

| image = Sendai subway 1014 20081021.jpg

| image_width = 300px

| caption =

| type = Rapid transit

| system =

| status = In operation

| locale = Sendai, Miyagi

| start = {{STN|Tomizawa|x}}

| end = {{STN|Izumi-Chūō|x|Miyagi}}

| stations = 17

| routes =

| daily_ridership =

| open =

| close =

| owner = 20px Sendai City Transportation Bureau

| operator =

| character =

| depot =

| stock = 1000 series

| linelength = {{Convert|14.8|km|mi|abbr=on}}

| tracklength =

| tracks = 2

| gauge = {{track gauge|1067mm|lk=on}}

| electrification = {{1,500 V DC}} from overhead catenary

| speed = {{Convert|75|km/h|mph|abbr=on|round=5}}

| elevation =

| minradius =

| map =

| map_state =

}}

{{Sendai Subway Namboku Line}}

The {{nihongo|Sendai Subway Namboku Line|仙台市地下鉄南北線|Sendai shi chikatetsu nanbokusen}} is a rapid transit line of Sendai Subway in Sendai, Japan. It connects Izumi-Chūō Station in Izumi-ku, Sendai, with Tomizawa Station in Taihaku-ku, Sendai. The line is {{Cvt|14.8|km}} long and has 17 stations. Like many mainline trains and metros in Japan, it uses the 1067 mm track gauge and runs on 1,500 V overhead line. The name "Namboku" means south–north, which is the general direction that the track runs.

The Namboku Line was the world's first public railway to use fuzzy logic to control its speed. This system (developed by Hitachi){{cite web |url=https://query.nytimes.com/gst/fullpage.html?res=950DE5DF133EF931A35757C0A96F948260&sec=&spon=&pagewanted=print|title= Fuzzy Computer Theory: How to Mimic the Mind?|accessdate=2007-10-31 |author=Andrew Pollack |date=April 2, 1989 |work=The New York Times}} accounts for the relative smoothness of the starts and stops when compared to other trains, and is 10% more energy efficient than human-controlled acceleration.{{cite magazine|url=http://www.time.com/time/magazine/article/0,9171,958640,00.html|archive-url=https://web.archive.org/web/20101022061850/http://www.time.com/time/magazine/article/0,9171,958640,00.html|url-status=dead|archive-date=October 22, 2010|title=Time For Some Fuzzy Thinking|accessdate=2007-10-31|author=Philip Elmer-DeWitt|date=September 25, 1989|magazine=Time}}