After two derailments over the course of just four days this week — one injuring 11 people and the other damaging important signaling equipment needed to keep the Red Line running efficiently — many MBTA riders are finding themselves at wit’s end. The recent problems have highlighted system-wide frustrations that residents have long complained about, including train delays caused by the much-dreaded "signal problems," 20-minute bus delays regularly blamed on traffic, and crumbling infrastructure at many T stations. What is the source of all these problems — and how can they be fixed?

In for Jim Braude, Adam Reilly was joined by Boston City Councilor Michelle Wu, Charlie Chieppo, senior fellow at the Pioneer Institute and former policy director for Governor Romney, and Chris Dempsey, director of Transportation For Massachusetts, a coalition of organizations aiming to improve transportation across the state.