A BART train runs along Highway 4 between the Pittsburg-Bay Point and North Concord stations in this file photo Monday, March 21, 2016, in Concord, Calif.

A BART train runs along Highway 4 between the Pittsburg-Bay Point and North Concord stations in this file photo Monday, March 21, 2016, in Concord, Calif.

Photo: Noah Berger / San Francisco Chronicle 2016