Comment by avuserow

What I perceive as the good bits of BART could be replicated on Caltrain with much less effort than replacing Caltrain with BART: the off-peak timetable. Caltrain does better for longer trips in my (limited to South Bay) experience, which makes sense since Caltrain average trip length is 1.5x to 2x longer than BART's. But overall, getting improvements seems much less technical and more political, and neither system seems to have much luck.