It was originally called Enron Field. After Enron dropped its naming rights, the ballpark was temporarily renamed Astros Field. The park was renamed again when Minute Maid bought the naming rights. Because the ballpark is small and cozy, it is sometimes called "The Juice Box". The stadium has a special roof which can be opened during nice weather and closed during rain. It also has a train above the outfield wall that moves on its track when the Astros get a home run.