The part about mezzanines struck me. BART has huge barren mezzanines. There is not one shop in the entire station. The other subways I've visited in the US (Boston, DC, NYC) also don't have any shops except in some of the largest like Grand Central or Penn station. Compare this with subways and train stations in Japan which often have shops in the mezzanines and sometimes at the platform. There are always at least ve…
I found that odd about BART, too - initially I thought this was due to crime (BART seems pretty sketchy, and opening up a shop there would be an invitation to robbers and thieves), but then I realized "safer" metros don't have them either.