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Alternative Japanese Design for Moving Subway Barriers: Minimum Viable Product, or Best Solution Within Constraints?
We can only go up from here
In New York City, you can still get killed by standing too close to the edge of a subway platform with your earbuds in. Each year a few people who aren't paying attention get pushed in front of a train by a crazy person. NYC still hasn't bothered installing the extra PEDs (Platform Edge Doors) that other cities around the world have.
These are typically full-height doors made of glass, and their dimensions and spacing correspond with the dimensions/spacing of the subway car's doors.
Paris
Hong Kong
São Paulo
Singapore
Sydney
However, in at least one train station in Japan (possibly Osaka Station, in the city of the same name) there is one weird alternative to these styles of doors that I'd not seen anywhere else:
First off, this system is acceptable in Japan (average height: 172cm, or 5'7 1/2") but wouldn't fly in Denmark (average height: 180.4cm, or 5'11").
Secondly--why on Earth is it designed like this? Surely a country that loves precision engineering as much as Japan, would have barriers that precisely correspond with the train's doors?
Based on what we can see in the GIF, my only guess is that the station takes incoming trains of different designs--i.e. the door spacing is not consistent from train to train, and the absurd width of these barriers compensates for that.
If that is the case, then I suppose that with this design, it can be said that form follows function:
- Having sideways-sliding doors wider than the structures they're meant to disappear within would be impossible, unless you added another degree of complexity (and cost) with a telescoping or folding design.
- Downwards-sliding doors or outward-swinging doors would both be wildly impractical.
- Therefore the only way for the doors to go is up. And with a span that long, it makes sense that they'd be made from multiple ropes or lightweight poles (my guess is plastic).
Of course, this barrier system won't stop the macabre Japanese practice of suicide by train, but it does make that act…somewhat less convenient.
Anyways, designers, your thoughts: Is this minimum viable product, or the best that the designers could do? Can you think of a better design that you imagine would remain within the same cost range as this one?
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Comments
I Think t's a good idea, but can't think of why it doesn't go closer to the bottom. That's enough room for someone to slide right under if they wanted to.
i wonder if there's a height clearance limit, otherwise I'll definitely do a rotating door that fans up and to the left and right that can also collapse into each side so it doesn't go incredibly high. (so 4 "panels" into 2 panels that also rotate towards the sides)
Last time I was there they were running a few generations/models of train, so your first guess may be correct. Although, I'll admit I wasn't too focused on the door design of each type.
I'm sure no kid will get its head stuck in it.
I think it is a good design. As you mentioned not sure if the stopping is automated. So it would be less of a headache for the driver to stop at precisely the right place to align the train door and the platform door. I think it is a minimalist alternative for the double door of the train and the platform.