Dee and the rest of the Bayesian Nakama are financing and building a new colony on the asteroid (442) Eichsfeldia. While said asteroid is 66 km across, its surface gravity is only 0.2% that of Earth's - pretty much freefall. In order to attract long-term settlers, the Nakama had to provide some way for them to avoid the negative biological effects of living for years on end without gravity.
Their solution: they dug a tunnel in a great big circle, about three miles long and a mile in diameter; installed a mag-lev train track on the 'outside' of the circle; and started building train-cars for it, running them around and around at around 200 mph, or taking about a minute to travel the whole route. Due to the magic of centrifugal force, anyone inside such a traincar feels a force equivalent to Earth's gravity.
There's room for about 400 standard 40-foot cars on that track, providing room for about 1600 colonists. There's also additional a second line of track on which run a bunch of half-sized "elevator" commuter cars, a swimming-pool car, a medical car, and similar accessories. Each colonist has as much cavern space as they want, for whatever possessions they have and activities they enjoy which don't require gravity (or a reasonable facsimile thereof). The whole collection of train, tunnels, shipyard, refineries, factories, and so forth, now forms the town of Oakfield.