We all know that there's nothing to stop people from eating and drinking beverages on BART, but can't there be something to discourage them from littering? I see people who not so slyly place their empty Starbucks cup underneath their seat, or crumble their napkins and food wrappers and leave it on the seats. Maybe BART should add small waste bins every 4 seats or whatever feasible so some of these people might actually just toss the items into the trash instead of leaving it all over the trains.
Even if 35% of the litter bugs toss trash into the bins, that is already a big improvement and might help keep the trains cleaner in the middle of the day.
I know I have drawn comparisons often between BART and transit systems in Europe, but yet again, I have to mention that trains in Europe have that, and it does make it easier for people to toss trash into the bins instead of on the floor.