Absorbent wool was, as you might imagine, unbelievably nasty. Among other things I saw on BART, I once saw a guy with severe flesh necrosis on his foot sit with said foot, bandages taken off, pressed against the seat. Of course, minor issues like diarrhea and vomit stains were more typical.
As why carpets and wool, the answer is actually just about as interesting as the linked article. Back in the 60s / 70s when BART started operating, it was one of the first metro subways. Its creators envisioned it as a futuristic luxury ride, whisking businesspeople and tourists in and out of far-flung suburbs to the glimmering high-rises of San Francisco. Everyone would be wearing a suit or a nice dress, and they would sigh in relief each time they daintily sat down in these airline-style seats.
The actual future turned out to be a bit more disappointing...
That's a pretty strong absolute; I'm certain that, at the very least, folk involved with public transportation do regularly consider homeless and/or addicts when covering various aspects of their service. Maybe not so much in the past, but these days it's basically a given.
It’s not being an actual circle line means it’s not as attractive to homeless people. You can’t just fall asleep and just ride in circles, you get up periodically and change trains now.
Homeless people are more likely to be on buses (it's cheaper) but even that isn't common.
Sweat, rain, dirt etc. are all going to come into the train.
What does that mean? It wasn't the first in anything by any stretch of the imagination.
In short, it was supposed to be a revolutionary metro, not just "yet another metro system". As it turned out, they would have been much better served by copying what was tried and true.
https://images.squarespace-cdn.com/content/v1/56200fcee4b020...
Uhh. No. London had the Underground literally 100 years before this and Boston had a subway around 1900. Paris, Moscow.. many subways predate BART.
Even local transit, e.g., BVG frequently uses fabric as seat material.
You just have to design it to be able to be cleaned easily and quickly.