To dream that you are riding a roller coaster represents life’s frequent ups and downs in your waking life. You are experiencing erratic behavior brought on by yourself or a situation.
Dreaming that a roller coaster is missing rails implies that you are lacking a support system in your waking life.
If you dream that you are stuck on a roller coaster or that the roller coaster has broken down, then it implies that a project or relationship has lost its momentum. Perhaps what started out as something fun or exciting has slowed down. Alternatively, a broken-down roller coaster refers to a project or plan that was poorly thought out.