The Trains is a small expansion for Aquaretto consisting of 18 tiles which have either one of four different-colored trains or curves. These are mixed in with the other tiles and taken off trucks just like those tiles. The trains are added to any empty space in your zoo and each different type of train (the four colors and the curve) in your zoo scores 2 points and each type in your depot scores minus two points at the end of the game. This expansion was part of the second collection of mini-expansions sold by Rio Grande for Zooloretto, which also included Zooloretto: Job Boards, Zooloretto: The Gorilla, Zooloretto: The Savings Book, and Aquaretto: Three Coworker Tiles. Also available as part of the Zooloretto: Goodie-Box.