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Pneumatics probably had a high point in 1930s Berlin, when the postal system there used citywide pneumatic tubes to shoot mail from post office to post office at speeds unmatched today for any parcel or physical object delivery system.
The concept of evacuated tubes is intriguing at first, but you soon realize that it has problems. Just like if the tube was filled with very few snowflakes and you drove a train through it, eventually covering the cab of the train with a layer of snow, all of any air remaining in the tube would pile up in front of the train, adding drag as it worked between the train and the walls or simply as a mass in front of it. There are solutions, but they aren't particularly simple or easy.
Transport, more and more, will tend to grow towards systems where the infrastructure is not easily damaged or compromised. Especially at high speeds, failure is not an option, nor are long and complicated repair times.
So we're going to build a 3,000 mile tube so that only 6 people at a time can travel in it?
I don't think so.
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