Starting July 6, South Summit Avenue in Gaithersburg will be closed to motorists to allow CSX Transportation to make repairs at the railroad crossing. MARC commuter rail service will not be interrupted. Signage on surrounding feeder roads will alert motorists to the closing, and detours will be in place directing them to the railroad crossing at Chestnut Street. Rail commuters can access the MARC Train Station via the pedestrian bridge from the Olde Towne Parking Garage and from the existing boardwalk that crosses the tracks in front of the station. The work is expected to take about five days to complete.