Chicago CTA's perpendicular train intersections

I can't think of any other place lately where I've marveled so much at the rail infrastructure. The perpendicular CTA lines of Chicago are not only beautiful in layout but also quite fun to watch as trains stop and wait for each other like cars would at a 4-way intersection. The video here is nothing special. I just wanted to include it because I was thinking of Chicago today.

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Japan's suspended Chiba Urban Monorail

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Defne Crowe—a New Kind of PR Maven for San Francisco's Maker Set - 7x7 Bay Area