[KboPAacDA3]

A similar feat was accomplished in Chicago.

"During the 1850s and 1860s, engineers carried out a piecemeal raising of the level of central Chicago. Streets, sidewalks, and buildings were physically raised on jackscrews."

https://en.wikipedia.org/wiki/Raising_of_Chicago

[Lammy]

See also: the canceled 1970s plans for taking the "L" underground: https://en.wikipedia.org/wiki/Chicago_Central_Area_Transit_P...

[reaperducer]

The Red Line and Blue Line of the L both run underground.

I once lived in a building that connected to the pedway, so I was able to dress in shorts and a T-shirt in a Chicago winter, navigate underground through the pedway to the Blue Line, then take the Blue Line to O'Hare for a flight to Tampa.

The train part was a bit chilly, but it was better than having to drag a winter coat with me on the plane.

[mixteacoffee]

it was done a few months ago as well to make room for new train tracks https://www.youtube.com/watch?v=sIKjxWcj2Dg