Red Line delays related to the ongoing NTSB investigation will continue through at least Thursday morning’s rush hour, Metro announced on Sunday night. The last time WMATA gave us an estimate for how much longer delays affecting the Red Line due to the June 22 crash would go on, they offered July 19 as the best case scenario, but it seems that was overly optimistic. Metro’s announcement also makes it plain that they can’t be sure that Thursday will be the end of it: “At this point, it is unclear what the NTSB’s needs may be after Thursday morning’s rush hour and the impact on Metrorail service. In the meantime, passengers can expect that their trips may take an additional 30 minutes or possibly more to complete, and they should build that added time into their plans.” The delays are caused by trains being forced to move one at a time at a reduced speed between Takoma and Fort Totten, while investigators continue their work at the crash site.