A cross border freight shuttle planned for cargo between Mexico and the USA is planned to overcome the problem of maintaining security when crossing the border. The idea is to develop a Universal Freight Shuttle to carry the wagons from one secure compound to the next.
If the Governments can find the $800 million or so needed to launch the scheme, a track would probably be laid in the vicinity of the Zaragoza Bridge. Both Governments would need to agree procedures, as security would be paramount,with sealed freight wagons heading between Customs points and control remaining firmly with Customs Border Patrol officers.