I'd vote for longitudinal seating with bench seating and poles (not three-pronged) placed along the benches as bizaro86 suggested along with as many bars/loop handles as possible mounted from the ceiling. The key is the impede the aisles as little as possible which is where the current version fails - those three-pronged poles block most of the aisle and prevent people from moving into the cars (especially since idiots like to take the seats right by the pole first...).
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