Aaron Moselle looks at the investigations and lawsuits coming in the aftermath of the Amtrak train derailment earlier this month in Philadelphia. Jessica McDonald hears union officials discuss a report on urban solar power. Mark Eichmann visits a shared-building housing program in Delaware. Dave Heller talks with CampusPhilly’s Deborah Diamond about the increase in college graduates staying in Philadelphia. Peter Crimmins reports on new ways authors are promoting their books.