Embedded in the inner surface of the outer shell was a magnetic rail system circling the gap between the inner and outer shell, with components attached to each shell. A container would run along the transport rail from the cargo bay, then transfer to the vector-matching system, and accelerate to match velocity with the rotating inner shell. At that point the container would be "handed off" from the outer shell to the inner, after which it would dock at one of four stations spaced equidistantly around the circumference of the inner shell.