Having gone to college and knowing this guy personally from then, you would have a much different opinion... Maybe he has grown up, but back then... yeeesh
They are also pressure fitted onto the axles. They are not bolted or otherwise fixed. The only thing which keeps them on the train is friction and the rail itself.
I was on a commuter train which derailed because it LOST a wheel. I don't understand why they aren't at least locked in mechanically. That wheel went rolling at 80MPH and blasted straight through trees near the tracks.
The "gas" is more like a fog of capsules. FM-200 is a common one. Basically it has a Fire suppression agent inside crystals which are blasted into the room by compressed air. These crystals melt when they get over a certain temperature and therefore won't kill you; however, breathing that in isn't really pleasant.
At least with Azure the new Windows Terminal App has Azure Cloud Shell in it. So you can use it like it was just a different session target and less fuss...