My first post since retiring and setting off on my travels.
Just a quick video showing the Chicago CTA elevated trains that run through the city. It’s the fourth largest rapid transit system in the US and believe me it can shift at quiet a pace on parts of the track. It can knock you back when they take off, so they have a light that flash’s inside the cars (they call them cars for some reason) to warn passengers. Many of the tall buildings you see are built on top of the line so they have sound proofing and fume extraction to reduce the noise and fumes.