Paris had a moving sidewalk in 1900, and a Thomas Edison film captured it (2020)
87 comments
·November 2, 2025delichon
mikkupikku
Asimov went into some detail with this premise too, in Caves of Steel iirc. I suppose he probably got it from Heinlein.
galaxyLogic
I read this as a teenager in a Sci-Fi compilation without paying much attention to the author, so I forgot where I read it or who wrote it or where I could find it again. But I composed and tape-recorded a melody to the lyrics which still hums in my head :
While you ride
While you glide
We are watching down inside
that your roadways go rolling along. ...
comrade1234
I think about this every time I get on a moving walkway and wish it had a few more speeds.
JKCalhoun
Yeah, love that idea of progressive velocities. I ant someone to at least build a short test track like this so we can play with it.
Seem to recall they were called "slidewalks" by some Sci-Fi author—probably Heinlein, eh?
rootbear
Larry Niven called them slidewalks and I've always been sorry this terminology never caught on.
Loughla
The things I took away from reading Niven was transfer booths. The world has homogenized because information and people were transmitted instantly one from corner of the globe to another.
Ooohhh boy.
bryanrasmussen
so assuming inner sidewalk moving at 100 mph, next outer at 95, and each moving at 5 per less, when big muscular terrorists placed on s-100 carrying a big cardboard box filled with nails and throw it as quickly and hard as possible so that the box of nails open up over s-75 at what velocity are the nails raining down on pedestrians on s-75?
Retric
Oddly I’m pretty sure a strong guy throwing a rock really hard at someone without the walkways would do way more damage. Nails at those speeds just aren’t that dangerous because their momentum is so low and they aren’t particularly sharp.
bryanrasmussen
Assuming that these terrorists are relatively fast runners, being in good shape, and they decide to exit the walkways on the other side, how far on the other side will they be in relation to the nail rain on s-75 they caused.
OisinMoran
Also Arthur C Clarke in The City and the Stars (1956):
“An engineer of the ancient world would have gone slowly mad trying to understand how an apparently solid roadway could be fixed at the sides while toward the centre it moved at a steadily increasing velocity.”
troupo
It was a recurring theme throughout most of Golden Age fiction.
E.g. Clifford D. Simak mentions them as a mode of transportation in The Goblin Reservation, Asimov has them in Robots of Dawn, and I'm sure I'm forgetting plenty more.
It could be that it was Heinlein who kicked of the trend.
bobthepanda
People have tried faster moving walkways many times. The problem is getting humans on and off such a system safely in a way that is easy to maintain.
In practice, everyday transportation systems need to accommodate a wide variety of users safely, like a toddler, or a commuter holding a cup of coffee, or a grandmother with a walker.
Animats
> People have tried faster moving walkways many times. The problem is getting humans on and off such a system safely in a way that is easy to maintain.
Right. You can build it, but not make it ADA-compliant. One subway station in France tried a 4km/h moving sidewalk, but the accident rate was too high.
The Paris system was really two trains on parallel tracks. Here's the mechanism.[1] Same concept as buses and trains where there are turntable sections between the cars. Powered by motors on the tracks. Possibly the first application of distributed power, with many motors pulling together in a controlled way.
Disney's PeopleMover, also powered by track motors and friction, can be thought of as a descendant. Disney had elaborate plans for little cars on tracks for EPCOT, but that never worked out.
[1] https://www.worldfairs.info/forum/viewtopic.php?f=10&t=125-l...
LiquidPolymer
I love the kid who is hamming it up at the bottom of the frame. I've been a photographer/videographer for my entire professional career and have run into this kid many, many times. Adults exhibit this behavior too but it is usually much more moderated.
This kid had to know what a camera was, which end was filming (some early film cameras appeared to be simple boxes), and wanted to make his mark on the final product.
illusive4080
It’s crazy to me watching this and thinking that if that kid lived to 100 he would’ve died 30+ years ago. That unknown child will be forever captured on this film.
Every time I watch old films with children in them I always think about how they’ve been dead, hopefully of old age, for a long time already.
TacticalCoder
> Every time I watch old films with children in them I always think about how they’ve been dead, hopefully of old age, for a long time already.
I've got movies (black & white, no audio) recorded on a "Pathe-Baby" camera [1] from my grand-mother and her sister, my great-aunt, in the early 1920s, where they're both little girls playing.
I knew them both very well, they lived through WWII in Europe and they both died old. My great-aunt lived until her 100th year.
Very few things are as moving as this little, short Pathe Baby vids I've got of them.
A few years ago we asked a little local shop to convert these to digital format and these files are precious treasure in the family.
jacobsenscott
Some guy smacks the kid with a light left hook at about 1:14.
mlok
Wikipedia has a nice page about it : "Rue de l'Avenir" (Street of the future)
userbinator
Scroll down to the photos and be momentarily surprised at the fact that some are in colour.
card_zero
Hand-colored, "photochromes". One of them is in Commons category "1900 black and white photographs". Check out "autochromes", though:
https://commons.wikimedia.org/wiki/Category:Autochromes
Leonid Andreev's moody selfie poses amuse me. (Circa 1910.)
https://commons.wikimedia.org/wiki/Category:Autochromes_by_L...
al_borland
I like that the fence moves with it. It seems like more of a complete vision than the moving sidewalks we have today, which always look like they were just dropped into a hallway.
We also seem to be unable to perfectly match food and hand speed these days. I’m not sure if this is a “feature” somehow, but it bothers me a lot. They didn’t seem to have this issue with the floor and fence, as far as I could tell.
bobthepanda
That’s because the systems are designed to be dropped into a hallway. In modern moving walkways and escalators, the treads and handrail belt return on the underside.
The system used in Paris requires a giant bulb shape to turn around the fence, which is generally a lot harder and more expensive to accommodate.
ItsHarper
I believe it's to allow room for the handrail belt to wear down, which brings its speed closer to the stairs until it starts de-syncing in the opposite direction. If it started perfectly, you'd have to replace the belt more frequently to maintain the same level of tolerance.
al_borland
If I’m understanding what you’re saying, couldn’t that be solved with some kind of belt tensioner?
CodeWriter23
It was probably pretty loud
tomcam
ZZ Top's name before it was ZZ Top was Moving Sidewalks
moritzwarhier
Modern urban car infrastructure is neither space- nor energy-efficient, but urban planning is long-term, and decisions shift all efficiency considerations in the long-term in a way that's hard to undo.
For example, transportation of people with the modern extensive net of streets would be most convenient and efficient if there was some kind of public transportation in small buses, available on demand and price being determined by regular market mechanisms. The difference between what I imagine and things like Uber would be a strong integration with existing train and bus lines, and public funding and legislation. Maybe self-driving will get us there, but there are also many political hurdles that make the less efficient option (high coefficient of cars pp) more attractive than the alternative that could provide better efficiency (and, ideally, also great user experience).
bluGill
On demand is bad! People have places to be and they need to be able to depend on arriving on time. on demand means they can't be sure when the transport will detour to pick someone else up thus making them late. what we need are reliable fixed routes that are predictable.
making on denand reliable means that there are more vehicles driving around than we now have cars - as empty vehicles reposition just in case someone else wants to go someplace right after you.
userbinator
Efficiency should not be pursued to the exclusion of everything else. As the article itself says:
transportation should be about more than just getting from A to B; it should be a pleasure as well
moritzwarhier
I would not deny this, and I don't judge people for enjoying to drive. It doesn't prevent me from thinking about alternative worlds / cities though, or in this case, just a stronger focus on establishing public car-based transportation (such as buses), in addition to train lines, which take very long to be built or are currently lacking space to be built altogether, where they would be most needed.
bluGill
That is stupid. people have places to be. Only a tiny minority are on transit for fun. Everyone else just wants to be there. you do these people a massive disservice by not making their ride efficient.
and the minority who are for the ride will figure out how to make it work.
jazzyjackson
Even with a job I'd rather spend an hour on a train than 35 minutes in LA traffic. (30 minutes... I guess I'd prefer the stress + a little more time for breakfast. But I'd put a 2x multiplier on not having to drive myself)
econ
I'm not sure. I want to see public transport in a city done with rollercoasters. The amount using it for fun would go up dramatically. It would change overnight from just another utterly boring city not worth visiting into a tourist hot spot. Similarly, people who need to be places will make it work.
Life is about the journey. All those roads and other boring means of transportation are just places no one wants to be.
shubb
I think citymapper tried to execu this as a pivot. They had an idea to do it in London and other countries and did trial it for a while. Not sure why it (presumably) failed.
I'd note that startup money of the is much harder to get in London, so a US startup might be able to force the idea from experiment to profitability.
cguess
> available on demand
This doesn't work in cities. The vast majority of peoples movement are not immediately necessary. They can wait 10-15 minutes (or plan ahead) for efficiency. This also cuts down on costs for everyone.
bluGill
On demand is bad but not for that reason. people have places to be and are bad at planning. You should be running every 5 minutes so even if they are running late it still isn't very long until you get there.
every 10-15 minutes is cheaper and so because of cost you are often forced to be this bad (or worse) just to be affordable, but it isn't what anyone wants and people who use such systems will dream of ways to make a car work where they are
djmips
Filmed by James Henry White. https://en.wikipedia.org/wiki/James_H._White
timcobb
> moving walkways, those standard infrastructural elements of such utilitarian spaces as airport terminals, subway stations, and big-box stores
big-box stores? where??
ggm
used to go between levels so a flat escalator, can take trolleys or there is a trolley chain haul beside. Bunnings (Hammerbarn if you must) have them. Giant tilt slab constructed category killers. Where sprawl is permitted they're a one layer building but in space constrained areas they have two or three (carpark under a 2 layer building) and these walkways exist to get your inflatable shark, chainsaw and bucket of chips down or up, depending.
galaxyLogic
At around 1.10 in the video something curious happens: a grown up "passenger"throws a young boy who tries to enter the sidewalk off it. What is going on? Were people more rude in those days?
bofadeez
Time traveler: "No, in 120 years we won't have moving sidewalks almost anywhere"
Tech enthusiasts: "Oh what a luddite, didn't you see the demo? This is the future!"
cogman10
Cars really messed a lot of that up.
In the 1900s every city was walkable. Most cities had trains of some sort for the majority of transport and bikes or horses for the last mile.
It really makes me sad to see even old cartoons showing off the tram systems of the day. Those all got pulled up for "progress" thrusting us all backwards into bumper to bumper traffic.
Whats incredible is that happened almost immediately after expansion of personal vehicles.
bobthepanda
Romanticizing horses, specifically, is a very rose colored glasses situation. At the turn of the last century, cities were getting overwhelmed by thousands of tons of horse feces, a similar volume of their urine, and the carcasses of overworked horses dropping dead in the street.
cogman10
> Romanticizing horses, specifically, is a very rose colored glasses situation.
Apologies, I wasn't trying to romanticize the horse aspect. Rather, the public transit and train shipping aspect.
In the US, at one point trains were so popular that even rural farms would have small train depots to load up crops on and ultimately ship goods wherever they need to be. You'd even find stores with train station docking.
In fact, before the national highway system, pretty much the only way to travel was by train.
We've taken a costly step backwards by building out the highway system and moving to semi shipping rather than keeping and expanding public transit.
bluGill
That is looking at the past through rose colored glasses. Walkable cities are too small to have the wealth of options a car (or transit) city does.
trains are nice but cars were faster for most (until congestion - but by then there were so few users that service was bad)
cogman10
> Walkable cities are too small to have the wealth of options a car (or transit) city does.
It's counter intuitive but it's quiet the opposite. I've lived in the UK for a while and in some pretty walkable cities. Even in the smaller cities, what you'd find is a wealth of different shops and options catering to all sorts of needs.
But then just consider that when you are walking you are being exposed to all the shops in the city.
Cars isolate. You are much less likely to notice the hole in the wall specialty shop and you are much more likely to instead just go to a Walmart or national brand place to get what you want. And you'll much more likely want to stop at all in one stores such as Walmart because you don't want to hop in your car multiple times to get the shopping done. In walkable cities, it's almost like a mall experience in every city center. 3 doors down is the hardware store and 2 more stores is the candy shop.
And because that downtown location is a highly desirable place with lots of foot traffic, any shop that goes out of business gets quickly replaced with another. Which means you generally end up with a lot of pretty high quality stores.
wongarsu
Being walkable doesn't preclude having transit though. It does clash with cars because cars need parking, and parking takes so much space that walking distances quickly become an issue. But subways, trams or even buses don't have that issue, they don't meaningfully decrease walkability
European cities are also quite car-infected, but in many the older core still work somewhat similar to how cities worked back then: you have the daily necessities within a 10 minute walk, for anything else you can fetch transit to the city center within 15 minutes, where you generally get everything else (except Ikea)
cyberax
> In the 1900s every city was walkable. Most cities had trains of some sort for the majority of transport and bikes or horses for the last mile.
Not the "last mile". The _only_ mile. Cities were so walkable that London had multiple distinct local accents because people were living their entire lives in one neighborhood, venturing outside only for special occasions.
This changed only with the invention of electric trams that allowed people to relatively cheaply move around. Technically, horse-driven trams were invented a bit earlier but they never got built at scale.
TOGoS
1900s MPEG compression was pretty intense.
throawayonthe
i think it's a reupload of this: https://en.wikipedia.org/wiki/File:Thomas_Edison,_Panorama_o...
which links to https://lccn.loc.gov/00694271 , but that does not seem to have a digital copy available
edit: well here's an archive but it's not any better https://web.archive.org/web/20231016184047if_/http://memory....
ProllyInfamous
At 5m39s of https://en.wikipedia.org/wiki/File:1900_-_The_Paris_Expositi... is a higher quality view of the walkway (plus thirty minutes of other sights to behold from that World's Fair).
7m20s of the same video clip features a clip shot of riders on the overhead converyor/walkway.
[the original film was silent, audio is faked]
thomastjeffery
Thankfully the second video contains a much more watchable film rip.
I'd guess that Heinlein was aware of it and scaled it up in his imagination.
https://ia601208.us.archive.org/32/items/calibre_library_178...