To accommodate higher passenger loads, BART has been testing new seating layouts. There are three configurations being tested:
This evening, I was riding in the 3rd one. Most of the seats were removed along one side of the car. I have to say, it did a good job accommodating five bikes, airport luggage, and an oversized wheelchair. The wheelchair user was thrilled that she finally got a window seat. Passenger volume was not that high, though, despite being rush hour.

Approaching 12th St Station

Relatively empty at the end of the line in Fremont
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The second configuration seems only ideal except for standing passengers, as someone with a bicycle, luggage, etc. would have to get past the remaining seats to reach the open area.