David O'Hara tells you about brakes and how effective they are:

A brake run on Scorpion

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. Image File history File links Download high-resolution version (910x1024, 209 KB) A brake run on Scorpion roller coaster at Busch Gardens Africa I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License... Image File history File links Download high-resolution version (910x1024, 209 KB) A brake run on Scorpion roller coaster at Busch Gardens Africa I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License... Scorpion is a steel looping roller coaster located at Busch Gardens Africa in Tampa, Florida, United States. ... A typical roller coaster The roller coaster is a popular amusement ride developed for amusement parks and modern theme parks. ... track Rail tracks are used on railways (or railroads), which, together with railroad switches (or points), guide trains without the need for steering. ... Roller coaster train comprised of 5 cars. ...

Trim brakes

Trim brakes are sections of brakes which are intended to adjust a train's speed during its course rather than bring the train to a complete stop. They may be engineered into a ride at its design stages at certain anticipated troubled spots, or later retrofitted once it's discovered that trains transverse certain areas at higher-than-anticipated speeds. Trim brakes are often either added for safety reasons, to lower G-forces in certain areas, or for maintenance/mechanical reasons, to lower the cost of wear-and-tear caused by the trains traveling at faster than normal speeds. Maintenance see repair and maintenance Maintenance is a legal term of art that is used to describe child support and alimony (also called spousal support). ...

Block brakes

Block brakes are sections of brakes located on any roller coaster wherever more than one train is intended to run. They act as virtual barriers between the trains running on the roller coaster, preventing collisions should one train stop along the course for any reason. Because of this, block brakes must be capable of completely stopping the train (should a vehicle preceding the block stop) and starting a train (after it has been stopped). Block brake sections usually start the train again in one of two ways including a slight downward slope to let gravity take its course, or by the use of drive tires pushing the train out of the block. Gravity is a force of attraction that acts between bodies that have mass. ... Drive tire along the brake run of the Shockwave roller coaster. ...

See Blocking. A typical roller coaster The roller coaster is a popular amusement ride developed for amusement parks and modern theme parks. ...

Types of brakes

Various types of braking exist when dealing with roller coasters, some of which have been recently developed due to technological advancements in design.

Skid brakes

Skid brakes essentially involve a long piece of material, often ceramic-covered, situated in the middle of the track parallel to the rails. When the brake is engaged, the skid raises and friction against the underside of the train causes the train to slow and eventually stop. Skid brakes were one of the first advancements in roller coaster braking and are usually not utilized in modern creations. Fixed Partial Denture, or Bridge The word ceramic is derived from the Greek word κεραμικος (keramikos, potters earth, or pottery). The term covers inorganic non-metallic materials whose formation is due to the action of heat. ... track Rail tracks are used on railways (or railroads), which, together with railroad switches (or points), guide trains without the need for steering. ... Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. ...

Friction brakes on a steel roller coaster

Image File history File links Download high-resolution version (1024x743, 188 KB) Friction brakes on a roller coaster. ... Image File history File links Download high-resolution version (1024x743, 188 KB) Friction brakes on a roller coaster. ...

Fin brakes

Fin brakes involve a metal fin being attached to the underside of a train. The track is fitted with two computer-controlled squeezing mechanisms which upon closing, squeeze the fin and either slow or stop the train. Fin brakes are the most common form of brakes on roller coasters today. Sometimes they are thick metal box beams (mostly on Bolliger & Mabillard roller coasters) and are engaged when compressed air flows into a metal drum, pushing joints on two sides in order to close shut two parallel brakes that in turn will drag along the box beam. Fin brakes are designed to be fail-safe, so that a loss of power will cause them to engage. Bolliger and Mabillard (B&M) is a roller coaster manufacturer based in Monthey, Switzerland. ...

Magnetic brakes

Magnetic brakes are a relatively new technology that are beginning to gain popularity due to their high degree of safety. Rather than slowing a train via friction (such as fin or skid brakes), which can often be affected by various elements such as rain, magnetic brakes rely completely on certain magnetic properties and resistance. In fact, magnetic brakes never come in contact with the train. In physics, magnetism is one of the phenomena by which materials exert an attractive or repulsive force on other materials. ...

Magnetic brakes are made up of two rows of very strong Neodymium magnets. When a metal fin (usually made of copper and brass) passes between the rows of magnets, eddy currents are generated in the fin, which creates a magnetic field opposing the fin's motion. The resultant braking force is directly proportional to the speed at which the fin is moving through the brake element. This very property, however, is also one of magnetic braking's disadvantages in that it can never completely (in theory) stop a train. This effect of magnetic braking can be explained by an example in which the train's speed is halved as it passes through each set of brakes. The train's speed (in any unit) would initially be 40, then 20, 10, 5, and so on. It is then often necessary to bring the train to a complete stop with an additional set of fin brakes or "kicker wheels" which are simple rubbers tires that make contact with the train and effectively park it. Neodymium magnet on a bracket from a hard drive A neodymium magnet or NIB magnet (also, but less specifically, called a rare-earth magnet) is a powerful magnet made of a combination of neodymium, iron, and boron — Nd2Fe14B. They have replaced marginally weaker and significantly more heat-resistant samarium-cobalt... General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance metallic pinkish red Atomic mass 63. ... This article or section does not cite its references or sources. ...

Magnetic brakes can be found in two configurations:

• The brake elements are mounted to the track and the fins are mounted to the underside of the train. This configuration looks similar to frictional fin brakes.
• The fins are mounted to the track and the brake elements are mounted to the underside of the train. This configuration can be found on Intamin's Accelerator Coasters such as Kingda Ka. This configuration is probably less expensive, as far fewer magnets are required.

In terms of pros, magnetic braking is virtually fail-safe because it relies on the basic properties of magnetism and require no electricity. Magnetic brakes are also completely silent and are much smoother than friction brakes; gradually increasing the braking power so that the people on the ride do not experience any unpleasant feelings. Many modern roller coasters, especially those being manufactured by Intamin, have utilized magnetic braking for several years. Another major roller coaster designer implementing these brakes is Bolliger and Mallibard in 2005 on their "Silver Bullet" inverted coaster and in 2006 on "Patriot". These later applications have proven effectively comfortable and relevant for these inverted coasters which often give the sense of flight. There also exist third party company's such as Magnatar tech. which provide various configurations of the technology to be used to replace and retrofit braking systems on existing roller coasters to increase safety and lower maintenance costs and labor. Expedition GeForce Intamin AG is a company based out of Wollerau (Switzerland) and is headed up by Sandor Kernacs. ... Storm Runner from Hersheypark. ... Kingda Ka is a steel roller coaster at Six Flags Great Adventure in Jackson, New Jersey, USA. It is currently the tallest and fastest roller coaster in the world, claiming the title from Top Thrill Dragster in Cedar Point. ... Expedition GeForce Intamin AG is a company based out of Wollerau (Switzerland) and is headed up by Sandor Kernacs. ...

Magnetic brakes on the same roller coaster shown above, located before the friction brakes

However, the main disadvantage of magnetic brakes is that they cannot completely stop a train, so they cannot be used as block brakes. They also cannot be conventionally disengaged like other types of brakes. Instead, the fins or magnets must be retracted so that the fins no longer pass between the magnets. These are the most effective brakes that slow the train quickly, and these are failsafe. 5 magnetic brakes can slow a 100 mph train down to 20 mph. That is why they are so popular! Image File history File links Download high-resolution version (1025x772, 146 KB) Magnetic braking mechanism on a steel roller coaster (Speed at Oakwood. ... Image File history File links Download high-resolution version (1025x772, 146 KB) Magnetic braking mechanism on a steel roller coaster (Speed at Oakwood. ...