MBTA officials have ruled out foul play and operator error as the cause of Tuesday’s Red Line derailment, but they still have not determined an exact cause and have no specific timetable for when service will return to normal.

Boston Biz Journal https://www.bizjournals.com/boston/news/2019/06/14/red-line-signal-damage-flagged-as-longer-term.html?ana=RSS&s=article_search