This file is a railroad map created and uploaded by Lincun on Japanese Wikipedia. It may also be a file based on one of these maps (see info in file history or author field for more info on later editors). Source is most likely one of Lincuns maps from Category:Locator maps of municipalities in Japan based on maps by Lincun:

• English: Usage data : Ministry of Land, Infrastructure, Transport and Tourism National Land Numerical Information (Administrative Area (N03), Railway (N02), Lake (W09))
• 日本語: 国土交通省 国土数値情報(行政区域(N03)・鉄道(N02)・湖沼(W09))

The original file was licensed {{GFDL}} and {{Cc-by-sa-3.0}}. See Category:Railroad maps by Lincun for more files like this.
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