Crews will be installing new fiber optic cable beginning late Sunday in the BART system and commuters should expect delays. The installation will occur between North Concord/Martinez and Pittsburg/Bay Point stations. Work will start just before midnight, continue overnight and conclude before the normal start of BART service on Monday, the agency said. Starting at midnight, riders can expect delays of 10-15 minutes. Copyright © 2026 Bay City News, Inc.