KeihinTohoku

Keihin-Tōhoku Line (京浜東北線) is a railway line operated by East Japan Railway Company (JR East) in the Greater Tokyo Area of Japan. The line runs from Omiya Station in Saitama Prefecture to Yokohama Station in Kanagawa Prefecture, roughly following the coast of Tokyo Bay. It serves as a major north–south commuter corridor, linking suburban communities in Saitama with central Tokyo and Yokohama.

Route and operation: The service passes through central Tokyo, sharing tracks with other JR East lines in the city. Key stations include Omiya, Urawa, Akabane, Tabata, Nippori, Ueno, Tokyo, Shinagawa, and Yokohama. The line runs primarily as local and rapid services, with high frequency during the day, especially near central Tokyo. Some trains operate through services to other JR East lines during peak periods.

Electrification and rolling stock: The line is electrified at 1,500 volts DC with overhead catenary. It is served by JR East commuter EMUs, including models such as the E231 series and E233 series, configured for 4–10 car formations depending on the segment and time of day.

History: The line dates to the early 20th century, built as part of development around Tokyo's coastal corridor. After the privatization of Japanese National Railways in 1987, JR East assumed operation of the Keihin-Tōhoku Line. The service has been expanded and modernized with upgrades to signaling, stations, and rolling stock to meet growing demand.

Significance: The Keihin-Tōhoku Line is one of Japan's busiest and most important suburban lines, facilitating daily commuting across Tokyo's southern and eastern districts and the wider metropolitan area.