The cars themselves ride on rubber wheels and roll along a concrete track. Each station has an island platform, and the Terminal station also includes additional side platforms on the outside of each track. In accordance with the Spanish solution, when a train arrives at the Terminal, the outboard doors open first to allow arriving passengers to exit before inboard doors then open, allowing departing passengers to board. At the Terminal station, trains reverse direction, and use a switch at a crossover located just north of the station to switch into the northbound tunnel. As of April 2017, the trains now reverse at a crossover located south of the main terminal station. This new configuration allows more trains to enter and exit the terminal station at an expedited pace. Crossover tracks also exist between each station, so traffic can be routed around stalled or disabled trains if necessary. A maintenance facility is located just beyond the Concourse C station, which is also where trains reverse at the north end.