The Points settings can be found on the fourth level of the Abandoned Mine. During the Haunted Mine quest, it is used to transport a glowing fungus through the mine without it going outside.
Checking the settings shows an interface including a Start button. Pushing that button will make the mine cart move.
The interface of the points settings. The settings displayed here are the correct settings.
The interface of the points settings showing the full completed route during an animation of the cart moving.
Appearance of the points settings before 6 February 2007.