I arrived at Oriente Train Station via the metro/underground to catch a train. Once you exit the…read moremetro/underground, the signage to enter Oriente is pretty poor, so look for very small train icons pointing with arrows. You essentially have to go up about three levels to get to Oriente. Once there, there are ticket machines and a ticket booth. Although I had tickets already, I had a question and the gentleman was very nice and informative (he spoke limited English).
I recommend waiting in the main concurse (open air) rather than going to the platform. Whiles there's a canopy over the tracks, it can be quite bright and there's not a lot of room to sit. Another advantage of waiting on the main concourse is there's a little cafe and vending machines. The cafe has a few tables and sells drinks, coffee, sandwiches, and desserts. The cafe only accepts cash. Be ready to deal with an attendant who could be friendlier.
Overall, decent train station but it needs better signage, as it lacks a large screen with all upcoming arrivals and departures. You also can't hear announcements very well.
Pro Tip: If you want to grab drinks and food for the train, there's a supermarket inside the mall across the street.