The TV movie Hyperloop may have looked cheesy, but at least you could stand up and walk around.

In 1973, Gene Roddenberry attempted to launch a post-apocalyptic science fiction series in the Buck Rogers vein largely built around a subterranean Hyperloop (actually more of a "Hyperloop," but let's not get picky). In the show, the system had been up and running by 1979, meaning we are running way behind.

From Wikipedia:

An elaborate "Subshuttle" subterranean rapid transit system was constructed during the 1970s, due to the vulnerability of air transportation to attack. The Subshuttles utilized a magnetic levitation rail system. They operated inside vactrain tunnels and ran at hundreds of miles per hour. The tunnel network was comprehensive enough to cover the entire globe. The PAX organization inherited the still-working system and used it to dispatch their teams of troubleshooters.