I've heard it stated that one reason BART doesn't run 24/7 is that they regularly need to be able to shut down a track to do maintenance. More track provides r

I've heard it stated that one reason BART doesn't run 24/7 is that they regularly need to be able to shut down a track to do maintenance. More track provides redundancy that allows them to redirect traffic from one track to the other when doing maintenance on it. There is more information about this on Quora: http://www.quora.com/Why-does-BART-need-to-do-nightly-maintenance?share=1 http://www.quora.com/Why-does-BART-need-to-do-nightly-mainte...