Top Thrill Dragster the world overtaking both world records from Steel Dragon 2000 at Nagashima Spa Land that was just built three years earlier. It lost the title of being the world's tallest and fastest roller coaster when Kingda Ka at Six Flags Great Adventure opened in May 2005. Intamin designed both Kingda Ka and Top Thrill Dragster, and the two share a similar design and layout that differs primarily by the theme and the additional hill featured on Kingda Ka. The ride had constant downtime in its first couple seasons. Several problems such as the ride's hydraulic system and launch cable caused
Millennium Force is no minimum age requirement, but guests must be between tall to ride. Persons over a certain weight or waist size are not allowed to ride if the seat and lap bar harness cannot accommodate them. Passengers on Millennium Force may not take loose articles onto the train and are required to wear shirts and footwear. Headphones must be removed before boarding. Guests are advised not to ride Millennium Force if they have recently had surgery, heart trouble, high blood pressure, neck or back trouble, or any medical condition that may be aggravated by riding, or are pregnant. Millennium Force