Train tracks are a form of centralization. Without the ability to reroute around disruptions (like cars and buses) a single stopped train (e.g. due to mechanical or passenger issues) can stop everything.
BART is dual track around the entire system, except for side yard entrances. I have seen stopped trains, and it was worked around. One I was on caught fire I. The middle of a station and it did not close the line. It slowed it down a lot but did not stop. There are so many systems in place, it's a quite complex system.
The real heros? The bus drivers. The baddies? The planners, the management. The evil? Pure unadulterated evil? The AC Transit app. I would give it a -11.
