One runs an aerospace parts maker, the other works in a restaurant near a major new oil refinery -- both women will vote in Mexican elections this weekend, but they could be from different countries. Mexico's economy has long operated at different speeds, with an industrial north closely linked to the neighboring United States outpacing a less developed south. It is an imbalance that outgoing President Andres Manuel Lopez Obrador has tried to address with infrastructure megaprojects including the oil refinery, a tourist railway and a new airport serving Caribbean beach resorts. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES