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But that would only make sense if most people lived in a line city.

There are much more effective ways to achieve population control than building line cities and moving people into them.

That explains why it might have been an appealing concept to the inceptor but it's still daft and it was obvious to me from the start that it wouldn't actually be made. I still don't know why anybody humored the premise of this thing getting built.

Worked well for Snowpiercer, so why not.

Daft in the case of a military conflict or some terrorist attack.