Minute Maid Park, previously known as The Ballpark at Union Station, Enron Field, and Astros Field, is a ballpark in Downtown Houston, Texas, United States, that opened in 2000 to house the Houston Astros of Major League Baseball (MLB). The ballpark is Houston's first retractable-roofed stadium, and features a natural grass playing field. The ballpark was built as a replacement of the Astrodome, the first domed sports stadium ever built, which opened in 1965. It is named for soft drink brand Minute Maid, a subsidiary of The Coca-Cola Company, which acquired naming rights in 2002 for $100 million over 30 years. As of 2015, Minute Maid Park has a seating capacity of 41,574, which includes 5,095 club seats and 63 luxury suites.
The largest entrance to the park is inside what was once Houston's Union Station, and the left-field side of the stadium features a railway as homage to the site's history. The train moves along a track on top of the length of the exterior wall beyond left field whenever an Astros player hits a home run, and/or the Astros win a game. The engine's coal car is filled with giant oranges in reference to Minute Maid's most famous product, orange juice.(Wikipedia)