From the Super Mario Wiki, the Mario encyclopedia
Flatbed Ferries appear in all Yoshi's Island installments, as well as Yoshi's Story. When jumped upon, they typically follow a preset path marked by a track. When a Flatbed Ferry reaches the end of the line, blocked by a little red sphere, it will switch its direction of movement; if the line ends without a sphere, the Flatbed Ferry will fall down, but may be "caught" by another track if it falls on one, and will start following it.
Flatbed Ferries appear in a variety of colors, such as green, yellow, and red, with each getting progressively faster; in the isometric sections found in certain fortresses, the colors are a pale pink, periwinkle, and cyan. Magenta ones appear as part of paddle wheels. Roger Lift and Blarggwich carry green Flatbed Ferries.
Game & Watch Gallery 2
In the first and second stages of the Game & Watch Gallery 2 rendition of Donkey Kong, Flatbed Ferries appear as the last platforms Mario must use to reach the goal. In both instances, they are activated temporarily by toggling a switch. In the first stage, the Flatbed Ferry revolves around a single point, similarly to a paddle wheel, and makes four 90 degree turns before completing one rotation. In the second stage, the platform swings from side to side on a chain in three positions. They are replaced in the Game & Watch Gallery 4 version with more thematically-fitting platforms.
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