SAN FRANCISCO (KGO) -- San Francisco Municipal Transportation Agency's train system is not only relying on humans to run it, but turns out that a floppy disk plays a key role.ABC7 news reporter Luz Pena spoke to SFMTA's director on their plan to upgrade the system that is decades old.We may be in Silicon Valley, but what if I told you that San Francisco's train control system is running off a floppy disk."Wow. I mean I thought we were moving on to AI. So why are we doing floppy disk," said Katie...