In the 19th century, there were a few railway systems that used air vacuum or air pressure. Some of them are described in Wikipedia:
RE: Elon Musks Hyperloop One: Its Forgotten NYC Precursor From 1870
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Elon Musks Hyperloop One: Its Forgotten NYC Precursor From 1870
That is true, you can check out one of the links below to get the information on the earliest ones from Columbia university. They had lines that were external, with a tube that pushed a block that was connected to the car on rails - but they had problems with too much leakage.
The most successful were the internal ones, both above ground in tube and underground in tunnels. It really became a thing over in England for awhile. But I'll wager many people alive today didn't know about this one underneath the streets of NYC!
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