One thought that occurred to me as I watched the train pass was how many safety regulations and zoning laws such a market would violate in most Western cities.
Then I realized: laws and regulations can have the unintended side effect of "sanitizing" the more interesting parts of our culture, to the point where everything becomes standard and boring.
It's the reason Seattle's Pike Place Market is a tourist attraction even though open-air fish markets are incredibly common all around the world.