Are Elevated or Underground Metro Systems Better?

Get your $100 donation matched with Givewell! To claim your match, go to www.givewell.or... and don’t forget to select “KZbin” and “City Beautiful”. Thanks!
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:
www.architectu...
www.mylondon.n... because most of it,actually runs above the Overground
journals.sagep...
australasiantr...
www.thestar.co... transit is generally considered,It also avoids traffic delays
ny.curbed.com/...
Produced by Dave Amos and the fine folks at Nebula Studios.
Written by Dave Amos.
Select images and video from Getty Images.
Black Lives Matter.
Trans rights.