DPU chief tells lawmakers on MBTA safety oversight: ‘We need to do more’

After investigators with the Federal Transit Administration concluded that DPU was falling short of fulfilling its duties as the agency responsible for MBTA oversight, DPU Chair Matthew Nelson faced more than an hour of pointed questions from legislators who wanted to know why the office appeared to remain on the sidelines while trains collided, careened off the rails and malfunctioned in recent months.