They are different systems. Bart is a regional transport agency funded by ticket sales and sales taxes in the Northern CA bay area. SF has regional bus lines bu

They are different systems. Bart is a regional transport agency funded by ticket sales and sales taxes in the Northern CA bay area. SF has regional bus lines but a few bart stops. SamTrans is the San Mateo bus system but they go all the way to Marin County and have a few stops in SF. Caltrain is a completely separate agency and funding unit that runs down the peninsula but also has two stops in SF. You can say they should all be consolidated but these are overlapping areas - BART can't have SF running it in the one area, Oakland running it in another area, etc. So consolidation means moving upward -- e.g. the state of California would run it. But no one wants to lose local control of services they are funding. Why would the city of SF cede control of its bus system to the state? So the control is where the funding is, and you have these overlapping and competing transit lines, all of which operate in San Francisco, but do not accept each other's ticket or payment systems.