page_title: 209 series
section_title: 209-3500 series
hierarchical_section_title: 209 series / 209-3500 series
caption_attribution_description: 日本語: 八高線209系3500番台。小宮～北八王子間 Nikon D750
context_page_description: The 209 series is an electric multiple unit commuter train type operated by East Japan Railway Company in the Tokyo area of Japan since 1993.
  The series was introduced in 1992 for experimental operations and 1993 for commercial operations to replace the aging 103 series stock on the Keihin–Tōhoku and Negishi lines. The concept of the 209 series was to create a low-cost, minimal lifespan train that would be replaced rather than rebuilt when they became life-expired.
  The 209 series was the first of the "New series trains", and served as the basis for the E501, E217, 701, and E127 series rolling stock, as well as the E231 series stock, which in turn became the blueprint for successive trains developed by JR East and other railway companies in Japan.
context_section_description: From 2018, five former 209-500 series ten-car sets based at Mitaka Depot for use on Chūō-Sōbu Line services were reformed and converted to become four-car 209-3500 series sets based at Kawagoe for use on Kawagoe Line and Hachikō Line services.
caption: Kawagoe/Hachikō Line 209-3500 series set, June 2018
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