Bathrooms The one-hour or less trips on the Mag Lev may not require an on-board bathroom, but the longer trips may.  Each Border Patrol Station and each train station will require both Men's and Women's rest rooms with baby changing areas.  Water in the desert is scarce, but due to the salt water being pumped in, the system can generate fresh water locally with small size desalination / purification units.  The waste water can be reused as Grey Water for irrigation.  Solid waste can be dried in spinners and sold as fertilizer or burned for fuel.   Index of ...