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Vienna retro-fitted every subway station with wheelchair and stroller compatible elevators.

Don't discount the latter, so much easier for parents to use the subway that way.

It totally can be done. The US carved off a slice of every sidewalk to allow for ramps for wheelchairs, nationwide.

Your might not be from the US, so I can understand how you might have such an impression, but wheelchair ramps, although universal for new construction, are usually not installed until either new construction occurs nearby or the sidewalk itself needs to be replaced unless a high traffic street. For example, although I think the installation of wheelchair ramps on sidewalks has been going on for at least 30 years, probably only about half of the curbs in my relatively-urban neighborhood have ramps.

It's simpler in Vienna though because they have a proof of payment system. You just need one elevator to the platform. In NY, you need one to the turnstiles, and then another one to the platform.

why they use actually turnstiles in NY? seem very inefficient on par with jams i experienced in Beijing which user them too

though i can understand need for them in China where people even refill their bottles in IKEA at self serving driving machines, but one would think that Americans are more honest

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