page_title: 209 series
section_title: MUE-Train
hierarchical_section_title: 209 series / MUE-Train
caption_attribution_description: English: JR East 209 series EMU, experimental train set "Mue-train" 日本語: JR東日本209系電車改造試験車両、"Mue-train".
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: In October 2008, JR East unveiled the seven-car "MUE-Train" (MUltipurpose Experimental Train) experimental EMU converted from former Keihin–Tōhoku—Negishi Line 209 series set Ura 2. This set is used to test and develop new technology for use on future narrow-gauge trains. The train is based at Kawagoe Depot and began testing on the Utsunomiya Line from November 2008.
caption: MUE-Train undergoing testing in May 2009
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