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Re:NYC's brand new subway is the most expensive in the world by herval on Sunday January 01, 2017 @08:09PM (#13298419)
The answer to your Tokyo question is in the "compendium of international subway projects", linked in the article (which also contains those numbers you quoted)
Re:NYC's brand new subway is the most expensive in the world by jessriedel on Sunday January 01, 2017 @08:42PM (#13298523)
Why not just answer his question and link to it?