BART does not currently run 24/7 primarily because they have to perform maintenance on the system, some of which requires that trains are not running. This is

BART does not currently run 24/7 primarily because they have to perform maintenance on the system, some of which requires that trains are not running. This is especially the case for the Transbay Tube which requires a lot of attention. If BART had two tubes then they could run 24/7 and still complete the required maintenance with shut down periods staggered at different times for each tube. This would allow the full system to remain running 24/7.