By Cassandra Garrison MEXICO CITY (Reuters) – Mexico is set to inaugurate a tourist train that is a flagship infrastructure project of President Andres Manuel Lopez Obrador, though experts say it is still a long way from being fully operational, with the opening rushed. “It’s the most important public work in the world,” Lopez Obrador said recently of the 1,554 kilometer-long (965 mile) project. An official ceremony on Friday will launch the first section of the so-called Tren Maya, a track from the southern state of Campeche to the tourist hotspot of Cancun. Another section from Palenque to C…