Vactrain

A vactrain (or vacuum tube train) is a high-speed rail transportation system. It is a maglev line using partially evacuated vacuum tubes or tunnels. A vacuum medium eliminates drag or resistance, permitting hypersonic speeds initially at around 6,000 to 8,000 km/h without the need for much input power.

Cargo is also transported considerably faster than before with this method. They also reduce transit-related greenhouse gas emissions by 90%. And due to the time they save, they provide billions of dollars of cost savings when compared to previous transportation methods.

The Hyperloop was proposed by Elon Musk and is an open-source vactrain design by Tesla and SpaceX.

Future
Transit tubes may be built on, above, or below the surface of a planet or space habitat, suspended under water to protect from bad weather, or attached to the outer hulls of space habitats and megastructures.

At the largest scales, mass drivers may be used to provide power to the transit cars, which magnetically couple to a network of mass beams. The distances covered can then be several orders of magnitude larger, and be even more efficient than evacuated tubes.