Single Rail System If the cost is too much for a dual rail system with four standard tracks and two Mag Lev tracks, then it is possible to build the BorderTransportationSystem with two standard tracks and two Mag Lev tracks, but design the system for future upgrading to the four standard track system.  Two standard tracks will give one single east to west and one single west to east track, which will work but will slow down the system as one will not be able to mix 60+ MPH trains with 140+ MPH trains. Index of ...