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68-436: Roller Coaster DataBase ( RCDB ) is a roller coaster and amusement park database begun in 1996 by Duane Marden. It has grown to feature statistics and pictures of over 12,000 roller coasters from around the world. Publications that have mentioned RCDB include The New York Times , Los Angeles Times , Toledo Blade , Orlando Sentinel , Time , Forbes , Mail & Guardian , and Chicago Sun-Times . RCDB

136-427: A furlong and a half in length, are made of wood, that may be used in summer as well as in winter. The process is, two of four persons fit in a little carriage and one stands behind, for more there are in it the greater the swiftness with which it goes; it runs on castors and in grooves to keep it on its right direction, and it descends with a wonderful rapidity. Under the hill, is a machine worked by horses for drawing

204-577: A Furlong, and 10 single square Chains an Acre, so that a square Mile contains 640 square Acres." —John Ogilby, Britannia, 1675 The official use of the furlong was abolished in the United Kingdom under the Weights and Measures Act 1985, an act that also abolished the official use of many other traditional units of measurement. In Myanmar furlongs are currently used in conjunction with miles to indicate distances on highway signs. Mileposts on

272-443: A bracket came off the top of the ride and hit a woman in the head while she was waiting in line. The woman did not die, and she reached a settlement with Cedar Point amusement park in 2023. The ride was subsequently refurbished and modified, and it reopened in 2024 as Top Thrill 2 . Kingda Ka closed on November 10, 2024. Superman: Escape From Krypton , a 415-foot (126 m) coaster, opened in 1997 at Six Flags Magic Mountain . It

340-403: A decade later, the immediate success of The Racer at Kings Island in 1972 sparked a new era of roller coaster enthusiasm, which led to a resurgence across the amusement park industry over the next several decades. There are several explanations for the name roller coaster . It is said to have originated from an early American design where slides or ramps were fitted with rollers over which

408-600: A double-eight, later enlarged to four figure-eight-shaped loops. In 1827, a mining company in Summit Hill, Pennsylvania constructed the Mauch Chunk Switchback Railway , a downhill gravity railroad used to deliver coal to Mauch Chunk, Pennsylvania – now known as Jim Thorpe . By the 1850s, the "Gravity Road" (as it became known) was selling rides to thrill seekers. Railway companies used similar tracks to provide amusement on days when ridership

476-405: A lift hill, however. A train may also be set into motion by a launch mechanism such as a flywheel, linear induction motor (LIM), linear synchronous motor (LSM), hydraulic launch, or drive tire. Some launched roller coasters are capable of reaching greater speeds using less track when compared to traditional coasters that rely on a conventional lift hill. A brake run at the end of the circuit

544-406: A ratchet and pawl. When riding a roller coaster with a ratchet and pawl system, the sound of clicks can be heard when pulling down the restraint. Hydraulic restraints use a piston and cylinder. Unlike mechanical restraints, there is no feeling of physical or sound of clicks from the restraint being locked in place. Most modern day roller coasters have sensors that are used to make sure each restraint

612-544: A ride. Also, "In a typical year, more than 385 million guests enjoyed in excess of 1.7 billion rides at approximately 400 North American fixed-site facilities". IAAPA is required to report annual ride incidents to the National Safety Council. Roller coasters are divided into two main categories: steel roller coasters and wooden roller coasters . Steel coasters have tubular steel tracks, and compared to wooden coasters, they are typically known for offering

680-504: A rod or a furlong, and the number of square feet and square yards in an acre. The definition of the rod went from 15 old feet to 16 + 1 ⁄ 2  new feet, or from 5 old yards to 5 + 1 ⁄ 2  new yards. The furlong went from 600 old feet to 660 new feet, or from 200 old yards to 220 new yards. The acre went from 36,000 old square feet to 43,560 new square feet, or from 4,000 old square yards to 4,840 new square yards. The furlong

748-446: A roller coaster's computer system. Multiple PLCs work together to detect faults associated with operation and automate decisions to engage various elements (e.g. lift, brakes, etc.). Periodic maintenance and visual inspection by ride engineers are also important to verify that structures and materials are within expected wear tolerances and functioning correctly. Effective operating procedures further enhance safety. Roller coaster design

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816-488: A sled would coast. This design was abandoned in favor of fitting the wheels to the sled or other vehicles, but the name endured. Another explanation is that the phrase originated from a ride located in a roller skating rink in Haverhill , Massachusetts in 1887. A toboggan -like sled was raised to the top of a track which consisted of hundreds of rollers. This Roller Toboggan then took off down gently rolling hills to

884-477: A smoother ride and their ability to turn riders upside-down. Wooden coasters have flat steel tracks, and are typically renowned for producing "air time" through the use of negative G-forces when reaching the crest of some hill elements. Newer types of track, such as I-Box and Topper introduced by Rocky Mountain Construction (RMC), improve the ride experience on wooden coasters, lower maintenance costs, and add

952-658: A square furlong in extent (eight to a mile, which explains the series of freeway exits: 19th Ave, 27th, 35th, 43rd, 51st, 59th ...). Much of Ontario , Canada, was originally surveyed on a ten-furlong grid, with major roads being laid out along the grid lines. Now that distances are shown on road signs in kilometres, these major roads are almost exactly two kilometres apart. The exits on highways running through Toronto , for example, are generally at intervals of two kilometres. The Bangor City Forest in Bangor, Maine has its trail system marked in miles and furlongs. The furlong

1020-519: A square furlong. At the time, the Saxons used the North German foot , which was about 10 percent longer than the foot of the international 1959 agreement . When England changed to a shorter foot in the late 13th century, rods and furlongs remained unchanged, since property boundaries were already defined in rods and furlongs. The only thing that changed was the number of feet and yards in

1088-407: A train attempts to enter an occupied block, the stopping mechanisms in all blocks are engaged. Restraints are another critical aspect to roller coaster safety. Roller coasters usually have two different types: Over-the-shoulder-restraints and lap bar restraints. With both, either hydraulic or mechanical safety mechanisms are used within the restraints. Mechanical restraints use a system known as

1156-430: A variety of different experiences. More focus is being placed on the position of riders in relation to the overall experience. Traditionally, riders sit facing forward, but newer variations such as stand-up and flying models position the rider in different ways to change the experiences. A flying model, for example, places riders lying down and facing forward with their chests and feet strapped in. Other ways of enhancing

1224-455: A wood track and steel structure. Other older examples include mine train roller coasters , many of which were built by Arrow Dynamics . The term hybrid became more prominent after the introduction of New Texas Giant at Six Flags Over Texas in 2011. Many in the industry, however, continue to classify coasters strictly by their track type only, labeling them either steel or wood. Modern roller coasters are constantly evolving to provide

1292-503: Is 201.168 metres, and five furlongs are about 1  kilometre ( 1.00584 km exactly). The name furlong derives from the Old English words furh ( furrow ) and lang (long). Dating back at least to early Anglo-Saxon times, it originally referred to the length of the furrow in one acre of a ploughed open field (a medieval communal field which was divided into strips). The furlong (meaning furrow length)

1360-461: Is also a base unit of the humorous FFF system of units. The exact length of the furlong varies slightly among English-speaking countries. In Canada and the United Kingdom, which define the furlong in terms of the international yard of exactly 0.9144 metres, a furlong is 201.168 m. Australia does not formally define the furlong, but it does define the chain and link in terms of the international yard. The United States previously defined

1428-458: Is another important aspect that requires a working knowledge of basic physics to enhance ride comfort and avoid harmful strain to the rider. Ride designers must carefully analyze the movement a ride subjects its riders to, ensuring it is within a reasonable tolerance. The human body needs sufficient time to react to sudden changes in force in order to control muscle tension and avoid harmful consequences such as whiplash . Designers typically stay in

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1496-581: Is approximately one furlong in length. City blocks in the Hoddle Grid of Melbourne are also one furlong in length. Salt Lake City 's blocks are each a square furlong in the downtown area. The blocks become less regular in shape farther from the center, but the numbering system (800 units to each mile) remains the same everywhere in Salt Lake County . Blocks in central Logan, Utah , and in large sections of Phoenix, Arizona , are similarly

1564-404: Is locked. If all the restraints are locked, it will send a signal to the ride computer letting it know that it is clear for dispatch. If all restraints are not locked, the train will not be able to move out of the station until each restraint is locked. Braking systems such as pivoting pawls are used on the bottom of the train and on the inclined lift hill. While the cart goes up the lift hill, it

1632-415: Is not typically classified as a strata coaster due to its shuttle coaster design, where trains do not travel a complete circuit. An exa coaster is a type of roller coaster with a height or drop of at least 600 feet (180 m). The term exa was first introduced by Intamin for Falcon's Flight, a 640-foot (200 m) coaster expected to open at Six Flags Qiddiya in 2025. Upon completion, it will be

1700-518: Is the most common method of stopping a roller coaster train as it returns to the station. One notable exception is a powered roller coaster , which instead of relying on gravity uses one or more motors to propel the trains along the course. In 2006, NASA announced that it would build a system using principles similar to those of a roller coaster to help astronauts escape the Ares I launch pad in an emergency, although this has since been scrapped along with

1768-511: Is used to measure rural field lengths and distances. In the United States, some states use older definitions for surveying purposes, leading to variations in the length of the furlong of two parts per million, or about 0.4 millimetres ( 1 ⁄ 64 inch). This variation is small enough to not have practical consequences in most applications. Using the international definition of the yard as exactly 0.9144 metres, one furlong

1836-401: Is usually pulled by a chain. The pawl moves over bumps that are separated closely apart. In the event that the train ever becomes disconnected from the chain, the anti roll-back system will engage and it will fall back into the nearest downhill stop preventing the train from falling down the lift hill. Another key to safety is the programmable logic controller (PLC), an essential component of

1904-634: The Scandinavian languages , the roller coaster is referred as "mountain-and-valley railway". German has the word Achterbahn , stemming from Figur-8-Bahn , relating to the form of the number 8 ( acht in German). This is similar to the Dutch Achtbaan , in which acht also means "eight". Roller coaster trains are not typically powered. Most are pulled up a lift hill by a chain or cable and released downhill. The potential energy accumulated by

1972-526: The Yangon–Mandalay Expressway use miles and furlongs. In the rest of the world the furlong has very limited use, with the notable exception of horse racing in most English-speaking countries, including Canada and the United States. The distances for horse racing in Australia were converted to metric in 1972 and the term survives only in slang. In the United Kingdom, Ireland, Canada, and

2040-499: The kiddie coaster , is a roller coaster specifically designed for younger riders. Following World War II, parks began pushing for more of them to be built in contrast to the height and age restrictions of standard designs at the time. Companies like Philadelphia Toboggan Company (PTC) developed scaled-down versions of their larger models to accommodate the demand. These typically featured lift hills smaller than 25 feet (7.6 m), and still do today. The rise of kiddie coasters soon led to

2108-554: The measuring chain in the 1620s led to the introduction of an intermediate unit of length, the chain of 22 yards, being equal to four rods, and to one-tenth of a furlong. A description from 1675 states, "Dimensurator or Measuring Instrument whereof the mosts usual has been the Chain, and the common length for English Measures four Poles, as answering indifferently to the Englishs Mile and Acre, 10 such Chains in length making

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2176-612: The 1930s, however, significantly impacted the amusement park industry and brought an end to the rapid growth experienced during the Golden Age. This aside, roller coasters were still built with varying success from location to location. In May 1932, the Scene Railway witnessed somewhat of a revival in the UK, including the opening of the roller coaster at Great Yarmouth . Today it is one of only two scenic railways still in operation in

2244-500: The Great is said to have constructed a sledding hill in the gardens of her palace at Oranienbaum in St. Petersburg. The Riding Mountain (a.k.a. La Grande Glisade ) entertainment pavilion designed by Bartolomeo Francesco Rastrelli for Tsarskoye Selo royal residence was built in 1754–1757. In Russian it was known as Katalnaya gora (Катальная гора, literally "Mountain for riding") It

2312-439: The UK. In 1959, Disneyland introduced a design breakthrough with Matterhorn Bobsleds , the first permanent roller coaster to use a tubular steel track. Designed by Arrow Development , the tubular track was unlike standard rail design on wooden coasters, allowing the track to bend in sharper angles in any direction, leading to the incorporation of loops, corkscrews, and inversion elements into track layouts. A little more than

2380-459: The United States, races are still given in miles and furlongs. Also distances along English canals navigated by narrowboats are commonly expressed in miles and furlongs. The city of Chicago's street numbering system allots a measure of 800 address units to each mile, in keeping with the city's system of eight blocks per mile. This means that every block in a typical Chicago neighborhood (in either north–south or east–west direction but rarely both)

2448-435: The ability to invert riders. A third classification type is often referred to as a hybrid roller coaster , which utilize a mixture of wood and steel elements for the track and structure. Many, for example, have a track made out of steel and a support structure made from wood. RMC has notably redesigned wood coasters that have either deteriorated from age or been deemed by parks as too costly to maintain. RMC often replaces

2516-411: The banking of curves. Wheels are a critical part in rollercoaster design. The purpose of wheels is to keep the train on the track and to prevent it from flying off. A majority of roller coaster wheels are made from polyurethane. There are 3 kinds of roller coaster wheels which include road wheels, side friction wheels, and up-stop wheels. Road wheels ride on top of the track. Side friction wheels ride on

2584-460: The carriages back again, with the company in them. Such a work as this would have been enormous in most countries for the labour and expense in cost, as well as the vast quantity of wood used in it. At the same place, there is another artificial mount which goes in a spiral line, and in my opinion, for I have tried it also, is very disagreable; as it seems always leaning on one side, and the person feels in danger of falling out of seat. Katalnaya gora

2652-470: The county. By 1919, the first underfriction roller coaster had been developed by John Miller . Over the next decade, roller coasters spread to amusement parks around the world and began an era in the industry often referred to as the "Golden Age". One of the most well known from the period is the historical Cyclone that opened at Coney Island in 1927. The onset of the Great Depression in

2720-456: The course of the ride to traverse the same track backwards. The oldest roller coasters are believed to have originated from the so-called "Russian Mountains", specially constructed hills of ice located in the area that is now Saint Petersburg, Russia . Built in the 17th century, the slides were built to a height of between 21 and 24 m (70 and 80 feet), had a 50-degree drop, and were reinforced by wooden supports. Later, in 1784, Catherine

2788-547: The development of "junior" models that had lift hills up to 45 feet (14 m). A notable example of a junior coaster is the Sea Dragon – the oldest operating roller coaster from PTC's legendary designer John Allen – which opened at Wyandot Lake in 1956 near Powell, Ohio. A hypercoaster , occasionally stylized as hyper coaster, is a type of roller coaster with a height or drop of at least 200 feet (61 m). Moonsault Scramble , which debuted at Fuji-Q Highland in 1984,

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2856-416: The experience involve removing the floor beneath passengers riding above the track, as featured in floorless roller coasters . Unique track elements, such as new inversions, are often introduced to provide entirely new experiences. Several height classifications have been used by parks and manufacturers in marketing their roller coasters, as well as enthusiasts within the industry. One classification,

2924-412: The first and the highest is full thirty feet perpendicular altitude; the momentum with which they descend this carries them over the second, which is about five or six feet lower, just sufficient to allow for the friction and resistance; and so on to the last, from which they are conveyed by a gentle descent, with nearly same velocity, over a piece of water into a little island. These slides, which are about

2992-566: The floor. The inventors of this ride, Stephen E. Jackman and Byron B. Floyd, claim that they were the first to use the term "roller coaster". The term jet coaster is used for roller coasters in Japan, where such amusement park rides are very popular. In many languages, including most Romance languages, the name refers to "Russian mountains". Conversely, in Russian, they are called "Американские горки" ( Amerikanskiye gorki , "American hills"). In

3060-456: The furlong was once also called an acre's length , though in modern usage an area of one acre can be of any shape. The term furlong, or shot, was also used to describe a grouping of adjacent strips within an open field. Among the early Anglo-Saxons, the rod was the fundamental unit of land measurement. A furlong was 40 rods; an acre 4 by 40 rods, or 4 rods by 1 furlong, and thus 160 square rods; there are 10 acres in

3128-481: The furlong, chain, rod, and link in terms of the U.S. survey foot of exactly 1200 ⁄ 3937  metre, resulting in a furlong approximately 201.1684 m long. The difference of approximately two parts per million between the old U.S. value and the "international" value was insignificant for most practical measurements. In October 2019, U.S. National Geodetic Survey and National Institute of Standards and Technology announced their joint intent to retire

3196-565: The mile, and 1½ miles to the league . A league was considered to be the distance a man could walk in one hour, and the mile (from mille , meaning "thousand") consisted of 1,000  passus (paces, five feet, or double-step). After the fall of the Western Roman Empire , medieval Europe continued with the Roman system, which the people proceeded to diversify, leading to serious complications in trade, taxation, etc. Around

3264-411: The park. The site is available in ten languages: English , German , French , Spanish , Dutch , Portuguese , Italian , Swedish , Japanese and Simplified Chinese . Roller coaster Tracks are typically built and designed as a complete circuit in which trains depart from and return to the same loading station . One variation, a shuttle roller coaster , reverses at some point throughout

3332-430: The range of 4–6 Gs (40–60 m s ) as a maximum for positive g-force acceleration, which increases the feeling of weight and pushes riders downward into their seat. For negative g-force, or the feeling of weightlessness, the target is 1.5–2Gs (15–20 m s ) as a maximum. These fall into a range considered safe to a majority of the population. Lateral acceleration is also typically kept under 2Gs using various techniques including

3400-463: The rest of the Ares program . Some sources have shown concern over the ability of roller coasters to cause head trauma and serious injury such as the tearing of axons and damaging of blood vessels. A variety of safety mechanisms protect riders on roller coasters. One of these is the block system . Most large roller coasters have the ability to run two or more trains at once, and the block system prevents these trains from colliding. In this system,

3468-423: The rides into special orders, including a list of the tallest coasters, a list of the fastest coasters, a list of the most inversions on a coaster, a list of the parks with the most inversions, etc., each sortable by steel, wooden, or both. Each roller coaster entry links back to a page which lists all of that park's roller coasters, past and present, and includes a brief history and any links to fan web pages saluting

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3536-466: The rise in height is transferred to kinetic energy , which is then converted back into potential energy as the train rises up the next hill. Changes in elevation become smaller throughout the track's course, as some mechanical energy is lost to friction and air drag . A properly-designed, outdoor track will result in a train having enough kinetic energy to complete the entire course under a variety of stressful weather conditions. Not all coasters feature

3604-456: The side of the track to keep the train on the track throughout turns. Up-stop wheels ride below the track and prevent the train from lifting off the track. Roller coasters are statistically very safe when compared to other activities, but despite all the safety measures in place, accidents still occur. The International Association of Amusement Parks and Attractions (IAAPA) reports that a rider has one chance in 15.5 million of being injured on

3672-466: The tallest roller coaster in the world. Furlong A furlong is a measure of distance in imperial units and United States customary units equal to one-eighth of a mile , equivalent to any of 660  feet , 220  yards , 40  rods , 10  chains , or approximately 201  metres . It is now mostly confined to use in horse racing, where in many countries it is the standard measurement of race lengths, and agriculture, where it

3740-412: The term strata was first introduced by Cedar Point with the release of Top Thrill Dragster, a 420-foot-tall (130 m) roller coaster that opened in 2003. Kingda Ka was the second strata coaster, and it opened at Six Flags Great Adventure in 2005 as the tallest roller coaster in the world with a height of 456 feet (139 m). Top Thrill Dragster closed in 2021 following a serious incident in which

3808-410: The track is divided into two or more sections known as blocks. Only one train is permitted in each block at any given time. There is a section of track at the end of each block where a train can be stopped if necessary, such as preventing dispatch from the station, stopping a lift, or applying brakes. Sensors detect when a train passes so that the system's computer is aware of which blocks are occupied. If

3876-609: The track, guide rails to keep them on course, and higher speeds. It spawned half a dozen imitators, but their popularity soon declined. However, during the Belle Epoque they returned to fashion. In 1887, Spanish entrepreneur Joseph Oller , co-founder of the Moulin Rouge music hall, constructed the Montagnes Russes de Belleville , "Russian Mountains of Belleville" with 656 feet (200 m) of track laid out in

3944-409: The wood track with their patented steel I-Box track design, while reusing much of the ride's wooden structure, resulting in a smoother ride with the incorporation of new design elements, such as inversions, sharper turns, and steeper drops. Although the term wasn't widely used or accepted until the 21st century, one of the oldest examples is Cyclone at Luna Park , which opened in 1927. It features

4012-537: The year 1300, by royal decree England standardized a long list of measures. Among the important units of distance and length at the time were the foot , yard , rod (or pole), furlong, and the mile . The rod was defined as 5 + 1 ⁄ 2  yards or 16 + 1 ⁄ 2  feet, and the mile was eight furlongs, so the definition of the furlong became 40 rods and that of the mile became 5,280 feet (eight furlongs/mile times 40 rods/furlong times 16 + 1 ⁄ 2  feet/rod). The invention of

4080-603: Was a huge building in the shape of rotunda . It had a trail with five hills which can be covered with ice in winter. In the summer time the trails used trolleys on wheels secured in the steel grooves mounted on the wooden trails. Due to a pendulum-like motion based on inertia all five hills could be traversed in one ride. The ride was engineered by Russian scientist Andrey Nartov . The Anglican clergyman John Glen King mentioned that some Englishmen visiting Russia called them "Flying Mountains" and described them as follows: You will observe that there are five mounts of unequal height:

4148-485: Was coined during the construction of the Millennium Force , a roller coaster built by Intamin on Cedar Point amusement park. Although Morgan and Bolliger & Mabillard have not used the term giga , both have also produced roller coasters in this class. A strata coaster is a type of roller coaster with a height or drop of at least 400 feet (120 m). As with the other two height classifications,

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4216-766: Was dismantled in 1792–1795. Currently in its place is the Granite Terrace in the Catherine Park . Two roller-coasters were built in France in 1817. Les Montagnes de Belleville ( Les Montagnes Russes à Belleville ) in Belleville, Paris had wheels attached to carriages and locked on tracks. The Promenades Aériennes , opened in Parc Beaujon in Paris on July 8, 1817 had wheeled cars securely locked to

4284-647: Was historically viewed as being equivalent to the Roman stade ( stadium ) , which in turn derived from the Greek system . For example, the King James Bible uses the term "furlong" in place of the Greek stadion , although more recent translations often use miles or kilometres in the main text and give the original numbers in footnotes. In the Roman system, there were 625 feet to the stadium , eight stadia to

4352-477: Was low. Using this idea as a basis, LaMarcus Adna Thompson began work on a gravity Switchback Railway that opened at Coney Island in Brooklyn , New York , in 1884. Passengers climbed to the top of a platform and rode a bench-like car down the 600-foot (183 m) track up to the top of another tower where the vehicle was switched to a return track and the passengers took the return trip. This track design

4420-480: Was soon replaced with an oval complete circuit. In 1885, Phillip Hinkle introduced the first full-circuit coaster with a lift hill , the Gravity Pleasure Road , which became the most popular attraction at Coney Island. Not to be outdone, in 1886 Thompson patented his design of roller coaster that included dark tunnels with painted scenery. "Scenic railways" were soon found in amusement parks across

4488-725: Was started in 1996 by Duane Marden, a computer programmer from Brookfield, Wisconsin . The website is run off web servers in Marden's basement and a location in St. Louis . Each roller coaster entry includes any of the following information for the ride: current amusement park location, type, status (existing, standing but not operating (SBNO), defunct), opening date, make/model, cost, capacity, length, height, drop, number of inversions , speed, duration, maximum vertical angle, trains , and special notes. Entries may also feature reader-contributed photos and/or press releases . The site also categorizes

4556-448: Was the distance a team of oxen could plough without resting. This was standardised to be exactly 40 rods or 10 chains. The system of long furrows arose because turning a team of oxen pulling a heavy plough was difficult. This offset the drainage advantages of short furrows and meant furrows were made as long as possible. An acre is an area that is one furlong long and one chain (66 feet or 22 yards) wide. For this reason,

4624-438: Was the first to break this barrier, though the term hypercoaster was first coined by Cedar Point and Arrow Dynamics with the opening of Magnum XL-200 in 1989. Hypercoasters have become one of the most predominant types of roller coasters in the world, now led by manufacturers Bolliger & Mabillard and Intamin . A giga coaster is a type of roller coaster with a height or drop of at least 300 feet (91 m). The term

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