Located in the train station at Chamartín, Eureka! is a nice little convenience store with lots of…read moresnacks, candy, water, juices, and more for your trip on the rails. I only grabbed a water and Starbucks café latte to go, but could easily have given into temptation and gotten a donut, chips, and a Kit Kat. Stop here for your snacks and you'll be all set for the journey ahead.