tracks pass each other at the halfway point. The first coaster to use an elevator system with a counterweight was Batflyer at Lightwater Valley. It is believed that those same designers then founded Caripro, which then constructed nine vertical lift suspended coasters between 1997 and 2001. The Mack Rides-built Matterhorn Blitz at Europa Park was the first to use a two-track system with a single shaft. Friction wheel lift A friction wheel lift is a type of lift mechanism in which two wheels are placed in either a horizontal or a vertical position. These are commonly used for brake runs, lifts, storage and more. The train has a small vertical lip, where the two friction wheels meet at each side. The wheels pull the train up slowly, while making a jet-like noise. An anti-rollback system is not needed, as the wheels are tight against the lip. Tilt lift/thrill lift section A tilt lift is a new way to elevate coasters. The tilt lift is essentially an elevator lift, but the elevator lift rotates 90 degrees so that the train is now vertical, with the nose of the train facing the ground. This design has not been made yet; the only places where this occurs are in the video games RollerCoaster Tycoon 3, Thrillville Off the Rails and Coaster Crazy. However, there are coaster designs that use the tilting aspect of this lift already. The first operating tilt coaster in the world is Gravity Max at Lihpao Land in Taiwan. The coaster was built by Vekoma. In this coaster, after going up a chain hill, the train is held on a horizontal section of track, which then tilts forwards, to become a vertical section, which then leads into a vertical drop accelerated by gravity. The Chinese company Golden Horse has made several unofficial recreations, each featuring a less than vertical drop and significantly different track elements. Anti-rollback device The familiar "click-clack" sound that occurs as a roller coaster train ascends the lift hill is not caused by the chain itself. The cause for this noise is actually a safety device used on lift hills—the anti-rollback device. The anti-rollback device is a standard safety feature, typically consisting of a continuous, saw-toothed, section of metal, forming a linear ratchet. Roller coaster trains are fitted with anti-rollback "dogs," essentially heavy-duty pieces of metal that fall and rest in each groove of the anti-rollback device