Madoka pauses for a second, processing that information. Though she does want to make sure and actually ask: "Do you not want people to know?"

Because Madoka can keep a secret if necessary! Whatever makes her friend the most comfortable, really. But if Raven doesn't mind sharing it with others, she thinks it may help other people get maybe even a step closer to solving the mysteries of this place.. There are a lot of smart people on the train, after all.