Editing Den-en-toshi Line (section)

===Prewar predecessors===
On March 6, 1907, the {{Nihongo|Tamagawa Electric Railway|玉川電気鉄道|Tamagawa Denki Tetsudō|"Tamaden"}} opened the first section of an [[interurban]] line between Shibuya and what is now {{STN|Futako-Tamagawa|x}}, using {{RailGauge|1372mm}} gauge.<ref>{{Cite web |last= |date=11 April 2020 |title=写真・図版（6枚目）{{!}} いまとはまるで違う56年前の「二子玉川」 世田谷南西部を支えた路面電車「玉電」と「砧線」〈AERA〉 |trans-title=Photos and illustrations: "Futako Tamagawa" 56 years ago, completely different from today Trams "Tamaden" and "Kinuta Line" that ran in the southwestern part of Setagaya |url=https://dot.asahi.com/print_image/index.html?photo=2020041000085_6 |access-date=5 March 2022 |website=AERA dot.}}</ref> The line was called the {{Nihongo|Tamagawa Line|玉川線}} and is not to be confused with today's [[Tokyu Tamagawa Line]] (東急多摩川線). The branch from [[Sangen-Jaya Station]] opened on January 18, 1925.