Metro is preparing to test software developed to back up the system meant to prevent train crashes.
The test is scheduled for Monday morning's rush hour.
After the Red line crash in June that killed nine people, the National Transportation Safety Board told Metro that its crash-avoidance system was inadequate and said the transit agency needed to develop a backup.
Although investigators haven't narrowed down the official cause of the crash, there's been a focus on the automatic train control system, designed to keep trains a safe distance apart.
Metro's deputy general manager Gerald Francis says it's too soon to know when a fully operable backup would be in place.
Natalie Neumann has the details...