Metro’s “SafeTrack” maintenance surge moved into its sixth phase on Monday, with single-tracking and delays hitting its busy Red Line. The adjustments may be a headache for commuters, but a derailment last week near the East Falls Church station highlights the need for good upkeep on the system’s tracks. But with Metro leaders discussing putting late-night weekend service on the chopping block for good, just how much maintenance work can Metro consumers handle? We discuss how Metro is handling its rehab work with WMATA Board Chair Jack Evans.