scott shaver spoke with bart's general manager, grace crunican. >> welcome to "newsroom." >> thank you. >> what do you see as the biggest challenge facing bart? >> well, we have a couple of challenges on our plate. we have the challenge of new riders wanting more of our service. we have the highest ridership ever. we have challenge of replacing almost the entire system. we're about 45 years old in construction. 42 years from the public's point of view. and we don't have the money to replace all of that. >> what's your experience? >> generally, really great. i love riding bart. and drake does too. >> if you could change anything about bart, what would it be? >> well, for one, i'd love to see bart run 24 hours. i think the bay area deserves a 24-hour transit system that reaches everywhere. >> we'd love to expand service. we haven't got the money to do that. i came to bart about 3 1/2 years ago. and the problems that they were facing at the time they last went out for the voter has to do with earthquake safety. so they put a lot of effort into earthquake safety, and they have done an exce