Since around 4:30 a.m., light rail vehicles have not been able to enter or exit the subway at the Duboce Portal, affecting routes of the N-Judah and J-Church trains, Muni spokesman Judson True said.
Inbound trains are switching to outbound trains at Church Street, True said.
Any customers traveling on J-Church or N-Judah trains should get off at Church Street station to transfer between the subway and surface trains.
Shuttle buses are on hand to supplement service, True said.
