Got it, thanks! I wasn't sure if it was common practice to split up "area"-type transit platforms like those into 2 separate "areas" (1 covered, 1 uncovered) and then have both of them added into the relation. In any case, I was at the waiting area a few days ago and discovered that the tracks indeed extend much further (i.e., southeast-bound) into the building than I first thought, so I will take a stab at re-positioning the Level-0 tracks, rooms & corridors more accurately (and keeping the Green/Orange rails as-is).

So that explains why they end up being re-rendered with a lighter shade than other buildings. I noticed that most recently with the 345 Harrison complex, and I see now the correct tagging of the land use separately from the buildings within. Makes perfect sense and looks like all others are re-tagged correctly too, thanks!

The park does indeed extend west beyond the overpass, it's been fixed now (I didn't notice any signage indicating the boundary while passing through yesterday, but it seems clear enough from this map: https://www.cityofboston.gov/images_documents/EMERALDN_tcm3-4403.PDF). For the remaining portion to the east, it seemed more appropriate to define the whole park as 1 area, rather than repeatedly defining separate areas at each individual block, but I wasn't sure if an area tagged as "leisure=park" should really be overlapping all of those streets, so the tag was initially removed but it's now re-added. I live directly adjacent to the Mall and walk through it everyday, so please feel free to let me know if you notice any missing or incorrectly-tagged features nearby, I'm happy to go out and survey to improve the area.

Thanks! I walk all over Boston myself, and to this point I've only added to the areas I know the best (Back Bay area). Still haven't ventured too far out into downtown yet, but I plan to add more soon

Not sure how that happened; changeset/86751464 reflects fixes