“The two train lines, Yamanote and Kobu, and the Sotobori streetcar route mentioned in Katai’s ‘The Girl Fetish’ , had different uses … The Yamanote line opened in 1884 but was not electrified until 1909 and was not convenient for traveling to work or school. It was used for carrying freight. It became a commuter train when its present circle of tracks around what became the heart of Tokyo was completed in November 1925.
“Yoyogi Station, used by the protagonist and schoolgirls of Katai’s story, was constructed in 1893 to serve the first all-electric commuter train begun in 1889, the Kobu railway, called the Chuo or central line after it became part of the national railway network in October 1906 and was the main artery of the Tokyo system. The Chuo was the nation’s first entirely electric railway. In 1907, it was a four-wheeled electric train car with a pole for passengers to grasp for stability, the first vehicle of its kind in Japan. The line was in service from 4:45 a.m. to 11:06 p.m., and a train came every seven minutes.”
– Tokyo in Transit: Japanese Culture on the Rails and Road, by Alisa Freedman, 2011
From the wiki: “The Kobu Railway opened the initial section of the Chūō Line from Shinjuku Station to Tachikawa Station in 1889. The company then extended the line both westward (toward Kofu, ijn 1903) and eastward (toward Tokyo, at Ochanomizu Station, in 1904) until it was nationalized in 1906. Service was further extended into Tokyo at Manseibashi Station in 1912 and Tokyo Central Station in 1919.
“In 1904, the section between Iidamachi Station (formerly located between Suidōbashi Station and Iidabashi Station) and Nakano Station was the first urban electric railway in Japan. Electrification was extended to Tokyo in 1927, and reached Kofu in 1931.”