Design a way in which to lay a set of rails that could control a chart powered by a motor, or a rocket, or animals, so it keeps always in the same track. a series of parallel iron rails could work.
the plan consists in building a series of roads on rails both on the City fragment and the City of light, linking the main entrances to the inner cities and the surface settlements, as well as with the piers.
This project requires the two cities to be precisely aligned such that the crafts can switch tracks. Thanks to the Gyroscape project, this is possible.
As for yet, this only implies building the rails and making all the necessary infrastructure. The vehicle is not designed yet.