Revealing mistake: In the shots of the Metro tunnels, the "rails" are flush with the concrete surface, as streetcar tracks would be, to form a level surface that automobiles can easily drive on. In a dedicated right-of-way, however, the engineers would not go to this unnecessary trouble and expense; the rails would simply be mounted on the tunnel floor. Also notable is the presence of crossovers, but the absence of any movable switching equipment, rendering them useless.
throcko
2nd Mar 2009