Old and new. The top photo is a picture of a Los Angeles metro tunnel on the Red Line—completely modern and bored smoothly into a circle barely larger than the trains themselves.
The bottom photo is a Paris metro tunnel on Line 12. It's old and gigantic, and the stations are so close together you can see one from another. But that's a good thing: you never have to look far in Paris to find a metro station.
Paris was probably constructed by excavating from the street level and then covering up, much like most of NYC Subways.
"and the stations are so close together you can see from another"
Not so great if you want to get from one end of the line to the other end fast (or mostly from end to end). Having local and express trains solves that problem, but you need more track.
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Unless you want to travel an appreciable distance in a reasonable amount of time.
It's like a pneumatic tube where nothing waits at the end but the eternal glare of death.
Directed energy weapon attached to farm equipment to kill weeds,
https://twitter.com/Rainmaker1973/status/1673720015793582081
Scale this up just a notch . . .
Actually, if this dramatically reduces the use of herbicides, it sounds pretty good.
First they came for the weeds . . . .
Surprised the LA Metro tunnel is as small in diameter as it is. That prevents introducing larger-width trains, which might be desirable in a decade or two.
More stations in Paris = more pickpocket group opportunities on the train. Helps to meet the locals. Both good and bad.
No NYC picture? Of course the way NYC MTA was cobbled together you get all kinds of tunnels and stops.
You know this is semantically wrong.