川辺謙一＠交通技術ライター
@kawaberry.bsky.social
元技術者｜鉄道・道路・都市｜著書26冊（海外版4冊）｜新刊『最新図解 鉄道の科学』発売中｜行き先を決めないドライブが好き
https://kawaberry.com
https://kawaberry.com
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