Moving walkway

A moving walkway or moving sidewalk (American English), known in British English as a travelator,^[1] travolator,^[2] or travellator, is a slow-moving conveyor mechanism that transports people across a horizontal or inclined plane over a short to medium distance.^[3] Moving walkways can be used by standing or walking on them. They are often installed in pairs, one for each direction.

History

The first moving walkway debuted at the World's Columbian Exposition of 1893, in Chicago, Illinois, in the United States. It had two different divisions: one where passengers were seated, and one where riders could stand or walk. It ran in a loop down the length of a lakefront pier to a casino.^[4] Six years later a moving walkway was also presented to the public at the Paris Exposition Universelle in 1900. The walkway consisted of three elevated platforms, the first was stationary, the second moved at a moderate speed, and the third at about six miles per hour. These demonstrations likely served as inspiration for some of H. G. Wells' settings mentioned in the "Science Fiction" section below.

The Beeler Organization, a New York City consulting firm, proposed a Continuous Transit System with Sub-Surface Moving Platforms for Atlanta in 1924, with a design roughly similar to the Paris Exposition system. The proposed drive system used a linear induction motor. The system was not constructed.

The first commercial moving walkway in the United States was installed in 1954 in Jersey City, NJ, inside the Hudson & Manhattan Railroad Erie station) at the Pavonia Terminal. Named the "Speedwalk" and built by Goodyear, it was 277 ft (84.5 m) long and moved up a 10 percent grade at a speed of 1.5 mph (2.4 km/h).^[5] The walkway was removed a few years later when traffic patterns at the station changed.

The first moving walkway in an airport was installed in 1958 at Love Field in Dallas, Texas. On January 1, 1960, Tina Marie Brandon, age 2, was killed on the moving sidewalk.^[6]

Moving walkways generally move at a slower speed than a natural walking pace, and even when people continue walking after they step on a moving walkway they tend to slow their pace to compensate, thus moving walkways only minimally improve travel times and overall transport capacity.^[7]

Designs

Moving walkways are built in one of two basic styles:

• Pallet type — a continuous series of flat metal plates join together to form a walkway – and are effectively identical to escalators in their construction. Most have a metal surface, though some models have a rubber surface for extra traction.
• Moving belt — these are generally built with mesh metal belts or rubber walking surfaces over metal rollers. The walking surface may have a solid feel or a "bouncy" feel.

Both types of moving walkway have a grooved surface to mesh with combplates at the ends. Also, nearly all moving walkways are built with moving handrails similar to those on escalators.

Pallet-types consists of one-piece, die-cast aluminium pallets. Example dimensions are: widths (between balustrades): between 32 inches (800 mm) and 56 inches (1200 mm), with a speed of 100 feet per minute (.5 metres per second), powered by an AC induction motor.^[8]

High-speed walkways

Early examples

In the 1970s, Dunlop developed the Speedaway system.^[9] It was in fact an invention by Gabriel Bouladon and Paul Zuppiger of the Battelle Memorial Institute at their former Geneva, Switzerland facility. A prototype was built and demonstrated at the Battelle Institute in Geneva in the early 1970s, as can be attested by a (French-speaking) Swiss television program entitled Un Jour une Heure aired in October 1974. The great advantage of the Speedaway, as compared to the then existing systems, was that the embarking/disembarking zone was both wide and slow-moving (up to 4 passengers could embark simultaneously, allowing for a large number of passengers, up to 10,000 per hour), whereas the transportation zone was narrower and fast-moving.

The entrance to the system was like a very wide escalator, with broad metal tread plates of a parallelogram shape. After a short distance the tread plates were accelerated to one side, sliding past one another to form progressively into a narrower but faster-moving track which travelled at almost a right angle to the entry section. The passenger was accelerated through a parabolic path to a maximum design speed of 15 km/h (9 mph). The experience was unfamiliar to passengers, who needed to understand how to use the system to be able to do so safely. Developing a moving hand-rail for the system presented a challenge, also solved by the Battelle team. The Speedaway was intended to be used as a stand-alone system over short distances or to form acceleration and deceleration units providing entry and exit means for a parallel conventional (but fast-running) Starglide walkway which covered longer distances. The system was still in development in 1975 but never went into commercial production.

Another attempt at an accelerated walkway in the 1980s was the TRAX (Trottoir Roulant Accéléré), which was developed by Dassault and RATP and whose prototype was installed in the Paris Invalides metro station. The speed at entry and exit was 3 km/h (2 mph), while the maximum speed was 15 km/h (9 mph). It was a technical failure due to its complexity, and was never commercially exploited.

In the mid-1990s, the Loderway Moving Walkway company patented and licensed a design to a number of larger moving walkway manufacturers. Trial systems were installed at Flinders Street Station in Melbourne and Brisbane Airport Australia. These met with a positive response from the public, but no permanent installations were made. This system is of the belt type, with a sequence of belts moving at different speeds to accelerate and decelerate riders. A sequence of different speed handrails is also used.

Trottoir roulant rapide (TRR)

In 2002, CNIM designed and installed the experimental, 185-metre (607 ft) trottoir roulant rapide high-speed walkway in the Montparnasse–Bienvenüe Métro station in Paris, France. At first it operated at a speed of 12 km/h (7.5 mph) but was later reduced to 9 km/h (5.6 mph) due to safety concerns. As the design of the walkway requires riders to have at least one hand free to hold the handrail, those carrying bags, shopping, etc., or who are infirm or physically disabled, must use the ordinary walkway beside it, and staff were positioned at each end to determine who could and who could not use it.^[10]

Using this walkway is similar to using any other moving walkway, except that there are special procedures to follow when entering or exiting at either end. On entering, there is a 10-metre acceleration zone where the 'ground' is a series of metal rollers. Riders stand still with both feet on these rollers and use one hand to hold the handrail and let it pull them so that they glide over the rollers. The idea is to accelerate the riders so that they will be traveling fast enough to step onto the moving walkway belt. Riders who try to walk on these rollers are at significant risk of falling over. Once on the walkway, riders can stand or walk as on an ordinary moving walkway. At the exit, the same technique is used to decelerate the riders. Users step onto a series of rollers which decelerate them slowly, rather than the abrupt halt which would otherwise take place.

The walkway proved to be unreliable, leading to many users losing their balance and having accidents. Consequently, it was removed by RATP in 2011 after nine years in service, being replaced with a standard moving walkway.

ThyssenKrupp Express Walkway

In 2007, ThyssenKrupp installed two high-speed walkways in Terminal 1 at Toronto Pearson International Airport.^[11] They connect the international gates in the newly opened Pier F, located at one end of the pier, with the rest of the terminal. One walkway serves departing passengers traveling towards the gates and the other serves arriving passengers traveling towards the terminal.

The walkway's pallet-type design accelerates and decelerates users in a manner that eliminates many of the safety risks generated by the moving belt-type used in Paris, making it suitable for use by people of all ages and sizes regardless of their health condition. The pallets "intermesh" with a comb and slot arrangement. They expand out of each other when speeding up, and compress into each other when slowing down. The handrails work in a similar manner, and because of this, there is no need to hold the handrails when entering or exiting the walkway. It moves at roughly 2 km/h (1.2 mph) when riders step onto it and speeds up to approximately 7 km/h (4.3 mph), which it remains at until near the end, where it slows back down.

Inclined moving walkways

An inclined moving walkway is a type of vertical transportation used in airports and supermarkets to move people to another floor with the convenience of an elevator (namely, that people can take along their suitcase trolley, shopping cart, or baby carriage) and the capacity of an escalator.

The carts have either a brake that is automatically applied when the cart handle is released, strong magnets in the wheels to stay adhered to the floor, or specially designed wheels that secure the cart within the grooves of the ramp, so that wheeled items travel alongside the riders and do not slip away.

Some department stores instead use shopping cart conveyors to transport passengers and their carts between store levels simultaneously. Walmart in Canada require users of wheelchairs and other mobility aids to be accompanied by shop staff when using their moving walkways, which they refer to as 'movators'.^[12] This policy has been superseded in some stores by the installation of elevators.

Applications

Moving walkways are frequently found in the following locations:

Airports

Moving walkways are commonly used in larger airports, as passengers – often with heavy luggage in tow – typically need to walk considerable distances. Moving walkways may be used:

• in passageways between concourses and the terminal
• within particularly long concourses
• as a connector between terminals, or
• as access to a parking facility or a ground transport station.

Of particular note is the Charles de Gaulle Airport in Paris, France, which has several moving walkways inside a series of futuristic suspended tubes. DFW Airport has 6 moving sidewalks, three moving from terminal C to Terminal A and three moving from Terminal A to Terminal C. They have been in use since 1982.

Museum exhibits

Moving sidewalks may be used:

• to ensure that a museum exhibit is viewed in a certain sequence
• to provide a particular aesthetic effect
• to make sure the crowd moves through at a reliable pace.

The 1975–76 American Freedom Train did this; they had a moving walkway inside each successive railroad car, thus maximizing the number of people who could view the interior exhibits in the limited time the train was stopped in each town.

The National Gallery of Art in Washington, DC, USA, uses a moving walkway to connect the two main galleries.

The Tower of London in London, UK, uses a moving walkway where visitors are passing the cabinets which contain the Crown Jewels.

Zoos

Similar to museums, some zoological park exhibits have a moving walkway to ease guests through an animal display or habitat. An aquarium at the Mall of America does this with a moving walkway made up of specially rounded pallets that enable it to change directions en route. The San Diego Zoo uses moving ramps to help guests ascend steep grades.

Theme parks

Some amusement park rides, such as continuous-motion dark rides like Disney's Omnimover rides, make use of a moving sidewalk to assist passengers in boarding and disembarking rides and attractions. Some examples include:

• the Ultra Twister, a roller coaster at the now closed Astroworld in Houston, Texas had a moving walkway with no handrail for passengers to step on prior to boarding their car. The walkway would move at the same speed as the approaching cars, allowing passengers completing the ride to step off and for boarding passengers to enter the car. An announcement played "Moving conveyor, please watch your step" to warn of the moving walkway.
• the exit from the Space Mountain attraction at Walt Disney World has a long moving walkway which changes inclination multiple times.
• the exit from the Pirates of the Caribbean attraction at Walt Disney World has an inclined moving walkway leading towards a gift shop.
• the Tomorrowland Transit Authority PeopleMover attraction at Walt Disney World has two inclined moving walkways to carry guests between the ground level and the attraction's load and unload stations, where guests step onto another moving walkway that is one of the few circular moving walkways

Theatre

The Phantom of the Opera by Andrew Lloyd Webber uses a travelator in the number 'The Phantom of the Opera' (act one, scene six), to give the illusion the Phantom and Christine are traveling the catacombs below the Paris Opera House a great distance to the Phantom's lair on the subterranean lake.

Public transport

Moving walkways are useful for remote platforms in underground subway/metro stations, or assisting with lengthier connections between lines, for example:

• London Underground (London): at Waterloo and Bank stations
• Glasgow Subway (Glasgow): from Buchanan Street subway station to Queen Street railway station
• MTR (Hong Kong): between Central and Hong Kong stations on Hong Kong Island, and between Tsim Sha Tsui and East Tsim Sha Tsui stations in Kowloon
• MRT (Singapore): in Bugis, Dhoby Ghaut, Serangoon and Botanic Gardens stations

A moving walkway was formerly part of the complex in Spadina subway station in Toronto, Canada. Installed in 1978, it reduced the travel time needed to transfer between the platforms on the Bloor-Danforth and the Yonge-University-Spadina lines. They were removed in 2004 and patrons are now required to walk between the stations.

Urban areas

Hong Kong is one of the world's most heavily populated cities, and has public escalators that connect many streets. See: Central–Mid-Levels escalators

Skiing

Moving walkways known as Magic carpets are also used in ski resorts. Skiers can place their skis on the walkway, which is designed to provide a strong level of grip. Since the walkways cannot be too steep and are slow compared to other aerial lifts, they are used especially for beginners or to transport people over a short uphill distance, such as to reach a restaurant or another lift's station. Moving walkways can also be found at chairlifts' entrances to help passengers in the boarding process.

Supermarkets

Inclined travelators are used by ASDA, Sainsburys, Morrisons, Marks & Spencer and Tesco in the UK, where they have also been found in non-supermarket stores such as IKEA and even the Nottingham branch of B&M Bargains. The new Tesco in Aberystwyth uses six inclined travelators (three up, three down in a criss-cross layout) to transport shoppers and their trolleys between the store, the rooftop car park and the under-store car park).^[13][14]

Science fiction

The concept of a megalopolis based on high-speed walkways is common in science fiction. The first works set in such a location are "A Story of the Days To Come" (1897) and When The Sleeper Wakes (1899) (also republished as The Sleeper Awakes), written by H. G. Wells, which take place in a future London. Thirty years later, the silent film Metropolis (1927) depicted several scenes showing moving sidewalks and escalators between skyscrapers at high levels. Later, the short story "The Roads Must Roll" (1940), written by Robert A. Heinlein, depicts the risk of a transportation strike in a society based on similar-speed sidewalks. The novel is part of the Future History saga, and takes place in 1976. Isaac Asimov, in the novel The Caves of Steel (1954) and its sequels in the Robot series, uses similar enormous underground cities with a similar sidewalk system. The period described is about the year 5,000.

In each of these cases, there is a massive network of parallel moving belts, the inner ones moving faster. Passengers are screened from wind, and there are chairs and even shops on the belt. In the Heinlein work the fast lane runs at 100 mph (160 km/h), and the first "mechanical road" was built in 1960 between Cincinnati and Cleveland. The relative speed of two adjacent belts is 5 mph (8 km/h)^[15] (in the book the fast lane stops, and the second lane keeps running at 95 mph (152 km/h)). In the Wells and Asimov works there are more steps in the speed scale and the speeds are less extreme.

In Arthur C. Clarke's novel, Against the Fall of Night (later rewritten as The City and the Stars) the Megacity of Diaspar is interwoven with "moving ways" which, unlike Heinlein's conveyor belts, are solid floors that can mysteriously move as a fluid. On pages 11–13 of the novel, Clarke writes,

An engineer of the ancient world would have gone slowly mad trying to understand how a solid roadway could be fixed at both ends while its centre travelled at a hundred miles an hour... The corridor still inclined upwards, and in a few hundred feet had curved through a complete right-angle. But only logic knew this: to the senses it was now as if one were being hurried along an absolutely level corridor. The fact that he was in reality travelling up a vertical shaft thousands of feet deep gave Alvin no sense of insecurity, for a failure of the polarizing field was unthinkable.

In his non-fiction book Profiles of the Future, Arthur C. Clarke mentions moving sidewalks but made of some sort of anisotropic material that could flow in the direction of travel but hold the weight of a person. The fluid would have the advantage of offering a continuous gradient of speed from the edge to edge so there would be no jumps, and simply moving from side to side would effect a change in speed.

In the Strugatsky brothers' Noon Universe, the worldwide network of moving roads is one of the first megaprojects undertaken on newly united Earth, before the advent of FTL starships and its consequences turned everybody's attention to the stars. These roads there are quasiliving organisms similar to Clarke's description and were used for both local commuting and long-distance non-urgent transport until their use was eclipsed by an instant teleportation network.

The animated TV series The Jetsons depicts moving walkways everywhere, even in private homes.

Slidewalk

A slidewalk is a fictional moving sidewalk structurally sound enough to support buildings and large populations of travelers. Adjacent slidewalks moving at different rates could let travelers accelerate to great speeds. The term is also used colloquially for a conventional moving walkway.

They were imagined by science fiction writer H. G. Wells in When the Sleeper Wakes. Robert A. Heinlein made them the instruments of social upheaval in the 1940 short story The Roads Must Roll. Isaac Asimov, in his Robot series, imagined slidewalks as the potential method of transportation of practically the entire urban population on Earth, with expressways moving at up to 60 miles per hour equipped with seating accommodations for long distance travel, and with slower subsidiary tracks branching off from the main lines. Arthur C. Clarke also used them in The City and the Stars. Larry Niven used them in Ringworld and Flatlander. Slidewalks figure prominently in the animated series "The Jetsons".

See also

References

External links

Media related to Moving sidewalk at Wikimedia Commons

• Walkway propels Paris metro into future, a BBC article on the high-speed travelator at Gare Montparnasse station in Paris. (provided by CNIM)
• Paleofuture: Moving sidewalks before the Jetsons
• Smart Links — Website for professionals working with short distance automated transport.