The traditional " pirate ship" style thrill ride often utilizes this type of restraint, as does the Troika.Ī drive tire, or squeeze tire depending on its usage, is essentially a motorized tire used to propel a roller coaster train along a piece of track. It can be argued that single-position buzz bars afford riders more air time on roller coasters, as ratcheting lap bars tend to lock further during the ride in many installations. Ironically some of the earlier ratcheting lap bar conversions use a solenoid release and can also produce a buzzing sound. Most parks have switched to individual ratcheting lap bars, similar to the lap bars found on steel coasters. There are other train types, such as NAD and even some PTC trains, that feature a single-position lap bar that has a mechanical release and therefore does not produce a buzzing sound. The term can be misleading as the buzzing sound only occurs on Philadelphia Toboggan Company (PTC) trains when the solenoid that releases the bar is out of alignment. Single-position lap bars on wooden roller coasters are sometimes referred to as "buzz bars," a slang term named for the buzzing sound that some bars make as they lock or release. These are either engaged at the control panel or operated by pulling or pushing large levers in the station. Some older coasters have manually operated friction or skid brakes, some with a pneumatic assist. On most roller coasters, the brakes are controlled by a computer system. One notable exception is the scenic railway roller coaster, which relies on an operator to manually control the speed of the train. The vast majority of roller coasters do not have any form of braking on the train but rather forms of braking that exist on track sections. Brake runs may be located anywhere or hidden along the circuit of a coaster and may be designed to bring the train to a complete halt or to simply adjust the train's speed.
A brake run on a roller coaster is any section of track meant to slow or stop a roller coaster train.
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