BART will shut down train service between the Walnut Creek and Concord stations on a weekend later this month to replace decades-old track. The transit agency said instead of trains going over that stretch on June 21-22, it will provide free bus service between the Walnut Creek, Pleasant Hill/Contra Costa Centre, and Concord stations. Riders can expect delays of 20 to 30 minutes through the area. The project will also require BART to cancel some late-night and early-morning trains. The schedule changes begin June 21, when the first southbound trains usually departing Concord at 5:35 a.m. and 5:55 a.m. will be canceled. Instead, the first southbound trains going to San Francisco will depart Walnut Creek at 5:43 a.m., 6:03 a.m. and 6:23 a.m. To accommodate southbound passengers, buses will d

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