自动步道你留意过吗？你是否想过，这条机场里寻常的平梯，曾承载着改变城市交通的宏大愿景？在本期Weekly中，我们将回望其百年发展历程，看它如何从早期的科幻狂想与世博会展品，逐步演变为特定空间内的高效实用工具。
我们正在体验的"未来世界"技术
如果你曾在机场站上自动步道，让它一路载着你前往登机口，那么你其实已经体验了一项曾经只属于"未来世界"的技术。如今，自动平梯已经变得极其寻常，以至于人们几乎不再注意到它们的存在。它们协助疲惫的旅客穿过漫长的机场航站楼，载着游客驶过游乐园，偶尔也在大型公共空间中穿梭输送人群。 但在一百多年前，人们对这种技术的想象要大胆得多。当时的发明家并不满足于让自动步道只在机场里帮人省几步路，而是设想它能够彻底改变城市交通。有人甚至认为，未来城市中的一部分步行、街车乃至地铁出行，都可以被不断移动的"人行道"取代。 这个点子可不是《杰森一家》（The Jetsons）想出来的。等到这部动画在1962年首播时，人们其实已经为"会移动的人行道"畅想、实验甚至实际建造了将近一个世纪。
If you have ever stood on a moving walkway at an airport and let it carry you toward your gate, you have experienced a technology that once belonged firmly to the future. Today, moving sidewalks are so ordinary that we barely notice them. They help tired travelers cross long airport terminals, carry visitors through amusement parks, and occasionally move crowds through large public spaces. But more than a century ago, inventors imagined something far more ambitious. They believed moving sidewalks might transform entire cities, replacing part of the walking, streetcar, and even subway journeys that filled everyday urban life. And no, The Jetsons did not invent the idea. By the time the cartoon premiered in 1962, people had already been imagining and building moving sidewalks for nearly a hundred years.
1871年"可移动路面"专利
最早严肃提出这一构想的，是美国发明家阿尔弗雷德·斯皮尔（Alfred Speer），他于 1871 年为其称之为"可移动路面"的系统申请了专利。他的构想远比今天机场里那种单一、缓慢移动的传送带复杂。斯皮尔设想设置三条并行的平台，而且速度逐级提高。乘客先踏上时速约3英里的第一条传送带，再转到时速6英里的第二条，之后还可以继续换到速度更快的平台。这样一来，人们可以逐步加速或减速，不必要求整条步道都以同样的速度运行。他甚至设想在沿途设置封闭式的"客厅车厢"，里面还有座椅和休息空间。斯皮尔并非仅仅想帮助人们走得更快，他实际上是在构想一种将"人行道"与"列车"融为一体的连续性公共交通工具。听上去很有未来感，但这并不只是纸上谈兵。几十年后，工程师真的开始建造类似的系统。
One of the earliest serious proposals appeared in 1871, when American inventor Alfred Speer patented what he called a system of "movable pavement." His vision was far more elaborate than the single slow moving belts found in airports today. Speer imagined three parallel platforms, each moving faster than the last. A passenger would first step onto a belt traveling at around three miles per hour, move from there to another traveling at six miles per hour, and continue increasing speed by changing platforms. In theory, this would allow people to enter and leave the system gradually without forcing the entire walkway to move at the same pace. He even pictured enclosed "parlor cars" appearing along the route, complete with sitting rooms. Rather than simply helping people walk faster, Speer was imagining a continuous form of public transportation that was part sidewalk and part train. The idea sounded futuristic, but it was not purely fantasy. Within a few decades, engineers would actually build versions of it.
世博会上的电动步道首秀
1889年的巴黎博览会曾有人提出修建移动平台，不过最终没有建成。真正的突破出现在四年后的1893年芝加哥世界哥伦布博览会。那里的参观者见到了最早一批电动自动步道之一。芝加哥的系统沿着码头延伸，一部分用途是把乘坐蒸汽船抵达的游客送往博览会场地。只要花5美分，游客就可以乘坐它而不用步行，而且沿途还设有长椅，可以坐着前进。这个装置并不完善，运行并不稳定，还经常发生故障。但它证明了一件重要的事：所谓"会移动的路面"并不只是发明家的幻想，它真的可以被造出来。到了1900年巴黎博览会，这个想法又以更壮观的形式重新出现。这一次，成千上万的游客使用了一套三层系统：最外层是静止平台，中间一层缓慢移动，最里面的一层则以大约每小时6英里的速度运行。为了让乘客在不同的移动平台之间转换时不至于失去平衡，平台上还设置了直立扶杆，供人抓握。当时的报道写到，很多人第一次接触这种新技术时显得手忙脚乱，但同时也乐在其中。于是，这条自动步道既是交通工具，也成了博览会本身的一项娱乐项目。游客不仅是在展馆之间移动，也是在亲身体验"未来的交通"可能是什么样子。
A moving platform was proposed for the 1889 Paris Exposition, although those plans were never completed. The real breakthrough came four years later at the 1893 World's Columbian Exposition in Chicago, where visitors encountered one of the first electric moving sidewalks. The Chicago system stretched along a pier and was intended partly to transport people arriving by steamboat toward the fairgrounds. For a nickel, visitors could ride rather than walk, and benches allowed them to sit along the way. The machinery was far from perfect. It was unreliable and frequently broke down. Still, it showed that moving pavement could exist outside an inventor's drawings. The idea returned in spectacular form at the 1900 Paris Exposition. This time, thousands of visitors used a three level system consisting of a stationary platform, a moderately moving one, and a faster platform traveling at about six miles per hour. Upright posts gave nervous passengers something to hold while stepping from one moving surface to another. Contemporary reports described people struggling awkwardly with the unfamiliar technology and enjoying themselves while doing it. The walkway itself became part transportation system and part attraction. Visitors were not merely getting from one exhibition hall to another. They were experiencing what transportation might look like in the future.
未来城市的想象
到了20世纪初，自动步道已经频繁出现在各种未来城市的想象中。插画家和作家描绘的城市里，人们甚至不再需要长距离步行。1925年，科幻出版人和未来学家雨果·根斯巴克（Hugo Gernsback）曾设想50年后的城市交通。他提出的系统同样由多条平行移动平台组成。最慢的一条方便乘客安全上下，速度更快的平台则负责真正运输，其中有些甚至设想达到每小时12至15英里。乘客还可以从这些移动平台换乘高架列车、地铁或电梯。这种设想非常符合当时人们对未来城市的典型想象：城市是分层的、自动化的，并且始终处在流动之中。街道不再完全被汽车占据，而是可能出现巨大的传送系统，把行人平稳地送过商业区和交通枢纽。在当时，自动步道看起来不再是一件猎奇的新鲜事物，而被认真看作传统城市交通的一种替代方案。
By the early twentieth century, moving sidewalks had become a recurring feature of futuristic thinking. Illustrators and writers pictured cities in which pedestrians no longer needed to walk long distances at all. In 1925, science fiction publisher and futurist Hugo Gernsback imagined what cities might look like fifty years later. His proposed urban transportation system again used several parallel moving platforms. A slow belt would allow passengers to step aboard safely, while faster belts, some traveling as fast as 12 to 15 miles per hour, would carry them across the city. From there, travelers might transfer to elevated trains, subways, or elevators. The concept fit perfectly with a popular vision of the city of the future: layered, automated, and constantly moving. Streets would no longer be dominated entirely by cars. Instead, enormous conveyor systems might move pedestrians smoothly through shopping districts and transportation hubs. For a time, the moving sidewalk seemed less like a novelty and more like a serious alternative to conventional urban transport.
固特异公司的交通拥堵对策
随着大萧条与二次世界大战的爆发，人们对自动步道的狂热兴趣一度放缓，但在战后的美国，这一概念迎来了强劲的复苏。20 世纪 50 年代，固特异公司（Goodyear）大力推广自动步道，将其视作解决城市交通拥堵的潜在方案。这个概念非常容易理解：可以把它想象成"一部横着运行的自动扶梯"。固特异提议建设大型"高速步道"（Speedwalks），用于体育场停车区，甚至设想把它们纳入重新设计的地铁系统。人们不必等公交，也不用挤出租车，只要踏上传送带，就可以持续向目的地前进。其中一些构想确实变成了现实。新泽西州泽西市的铁路终点站之间曾建有自动步道，休斯敦体育馆与停车场之间也安装过类似系统。加利福尼亚州的特里尼蒂大坝还建过一条特别长的移动平台，全长约两英里，不过它主要是为了在施工期间运输材料，而不是用来载送城市通勤者。然而，那个由移动传送带覆盖整座城市的宏伟梦想，终究未能全面降临。
Interest slowed during the Great Depression and World War II, but it returned strongly in postwar America. During the 1950s, the Goodyear company promoted moving sidewalks as a possible solution to urban congestion. The idea was easy to explain. Imagine an "escalator running flat." Goodyear proposed using large "speedwalks" to carry pedestrians through stadium parking areas and even redesigned subway systems. Instead of waiting for a bus or squeezing into a taxi, people could simply step onto a continuously moving belt and travel steadily toward their destination. Some of these ideas did make it into the real world. Moving walkways connected rail terminals in Jersey City, while another system carried visitors between the Houston Coliseum and its parking lot. A particularly long installation at California's Trinity Dam stretched for about two miles, although it was designed primarily to help move materials during construction rather than to carry city commuters. Yet the grand dream of entire cities covered with moving belts never arrived.
覆盖整座城市的难题
为什么这种设想最终没有大规模普及？从这些早期系统的历史来看，关键在于一个非常现实的问题：在码头、博览会场地，或体育场与停车场之间表现良好的自动步道，一旦试图推广到整座城市，难度就会大幅增加。以 1893 年的芝加哥博览会步道为例，该系统本身便已极易发生故障，而那些更雄心勃勃的设计，通常需要多条传送平台持续运行，并且每条平台还要保持不同的速度。要在繁忙的城市街道中建设并长期维护这样一套庞大的系统，显然要比在固定路线铺设一条短距离步道复杂得多。因此，自动步道最终更适合出现在可控的环境中，也就是大量人群会沿着相同方向、重复经过同一路线的地方。相比之下，把它发展成覆盖整座城市、取代其他城市交通方式的系统，实际操作起来就困难得多。
Why not? The history of these early systems points to a practical problem: what worked well along a pier, inside an exhibition, or between a stadium and a parking lot became much harder to scale across an entire city. The 1893 Chicago walkway, for example, was already prone to breakdowns, and more ambitious designs required several continuously moving platforms operating at different speeds. Building and maintaining such a network through busy streets would have been far more complicated than installing a short walkway along a fixed route. Moving sidewalks therefore proved most useful in controlled spaces where large numbers of people travel in the same direction, rather than as a replacement for an entire urban transportation system.
机场和乐园里的自动步道
后来，自动步道逐渐找到了一个更低调、也更实用的位置。机场几乎是最适合这种技术的环境。航站楼可能非常长，旅客通常还拖着行李，而且大多数人的行进方向比较明确。在这种情况下，自动步道可以帮助人们更快地走完长距离，却不需要像城市交通那样构建复杂的网络。主题乐园也很适合使用移动平台。它们可以持续把游客送往游乐设施，并帮助人们更高效地上下项目。固特异开发的相关技术后来也进入了迪士尼乐园，一些项目利用移动平台来维持大量游客持续而顺畅地流动。自动步道最终没有消失，只是人们对它的期待发生了变化。它没有替代整座城市的街道，而是成为一种专门应用在固定场景中的工具，特别适合那些每天都有成千上万人沿同一条路线移动的地方。
Instead, moving sidewalks gradually found a more modest and more practical role. Airports were almost perfect environments for them. Terminals can stretch for enormous distances, passengers often carry luggage, and the direction of travel is predictable. A moving walkway can help people cover those distances faster without requiring the complicated network that a citywide system would need. Theme parks found another use. Moving platforms can carry riders continuously toward attractions and help them board and exit rides efficiently. Goodyear's technology eventually appeared at Disney parks, including attractions where moving platforms keep large numbers of visitors flowing smoothly. The technology survived, but the dream changed. Instead of replacing sidewalks across whole cities, moving walkways became specialized tools for places where thousands of people repeatedly travel along the same path.
