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Chicago is one of the only cities in the world with elevated metro lines running through downtown. Why is that? Are underground lines better than above ground?

Resources on this topic:

https://www.architecture.org/learn/re...

https://www.mylondon.news/news/zone1... because most of it,actually runs above the Overground

https://journals.sagepub.com/doi/pdf/...

https://australasiantransportresearch...

https://www.thestar.com/news/gta/high... transit is generally considered,It also avoids traffic delays

https://ny.curbed.com/2018/6/27/17507...

Produced by Dave Amos and the fine folks at Nebula Studios.
Written by Dave Amos.
Select images and video from Getty Images.
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