I haven't been to the Hudson Yards stop, but many NY subway platforms are very cramped by modern transit standards (compared with even, say the DC metro). I'm s

I haven't been to the Hudson Yards stop, but many NY subway platforms are very cramped by modern transit standards (compared with even, say the DC metro). I'm sure they're not accessible and hard to make so, and some sections are so narrow as to be positively dangerous. Building new platforms that were just "as wide as the original subway platforms" would be the bonkers thing. Sure it's more expensive to build it big, but I bet its more expensive still (if not totally impossible) to build it small then _re_build it big a few decades later.