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"Poised between intransigent scepticism and uncritical credulity, it [science fiction] is par excellence the literature of the open mind."
- John Brunner

Vacuum Cylinder  
  Traveling first class, but like mail, in a tube system.  

This might be a good description of what it will be like to travel in the Hyperloop, if they ever build one.

We've got to get into his office secretly, by tte vacuum cylinders. We're to meet a man from his office at the Eighth Postal switch-station."

The girls were both in gray, with long dark capes. We took the public monorail down into the mid-Manhattan section under the city roof of the business district, and into the Eighth Postal switch-station where the sleek bronze cylinders came tumbling out of the vacuum portes to be rerouted and dispatched again,

A man was on the lookout for us.

"Daniel Dean and party?"

"Yes," said Snap. "We were ordered here..."

We were put into one of the oversize mail cylinders, routed through the tubes like sacks of recorded letters; and in ten minutes, with a thump that knocked the breath from all of us, we were in the switch-rack of Halsey's outer office.

From Wandl, The Invader, by Ray Cummings.
Published by Astounding Stories in 1939
Additional resources -

A bit more:

In the service room a passenger cylinder was waiting. Our guide entered it with us. At the switch-station we had our breath knocked out with the bumping, but the cylinder remained sealed. And after another ten minutes in the vacuum tube, we reached our unknown destination.

The cylinder-slide opened.

Compare to the vacutubes and the bounce tubes both by Heinlein.

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Additional resources:
  More Ideas and Technology from Wandl, The Invader
  More Ideas and Technology by Ray Cummings
  Tech news articles related to Wandl, The Invader
  Tech news articles related to works by Ray Cummings

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