A mechanized transport system between the five islands of Riven.
Because the islands ever separated because of tectonic plate shifts, some bridges were rendered useless for long spaces. Gehn ordered one of the Rivenese Guilds (perhaps the Guild of Builders) to pursue the design of a new system. It levitated above rails thanks to two huge magnetic coils, with each given the identical amount of power, the functional power distribution 48 units (7 units below the optimum). Slight imperfections in the metal affect the symmetry of the magnetic fields of power.