Straight-and-Narrow Track

The Straight-and-Narrow Track is a treasure in. It is actually a piece of a toy train track.

Collecting the treasure
The Straight-and-Narrow Track is on a platform at the far west of sublevel 2 of the Ultimate Testing Range. The path back to the S.S. Beagle is blocked by three Miniature Snootwhackers and a Withering Blowhog, which should be defeated before attempting to collect it. To collect this treasure, you must throw 7 Pikmin at it. The exit is block by an iron fence, so you must either use Winged Pikmin or press the button in the center of the sublevel to collect it.

Trivia

 * The Straight-and-Narrow Track's name is a double meaning: The treasure itself is, literally, a straight and narrow piece of train track. "Straight and narrow," however, also means a path that is, relatively speaking, honest and moral, as Olimar's notes mention.