Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Roller coasters are composed of various elements, the individual parts of the design and operation, such as a track, hill, loop, turn, etc. Variations in normal track movement that add thrill or excitement to the ride are often called thrill elements." A brake run on a roller coaster is any section of track meant to slow or stop a roller coaster train. Brake runs may be located anywhere 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. Contrary to some belief, the vast majority of roller coasters do not have any form of braking on the train itself, but rather forms of braking that exist on track sections. One notable exception is the scenic railway roller coaster, which relies on an operator to manually control the speed of the train. On most roller coasters, the brakes are controlled by a computer system, but some older wooden roller coasters have manually operated brakes. These are controlled by large levers operated by the ride operators."
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