Muni train service was disrupted Tuesday evening between West Portal and Church stations after a driver entered a tunnel near West Portal, according to Muni.
San Francisco Municipal Transportation Agency officials first reported the incident around 7 p.m. on Twitter.
Passengers were being advised to seek buses where possible during the incident and BART was providing mutual assistance for riders between Embarcadero and Balboa Park stations.
As of around 8 p.m. the N Judah and J Church lines were back to normal operation, but riders were warned to expect residual delays.
A polite reminder: Please don't drive your car into the subway.
— Jeffrey Tumlin (@jeffreytumlin) November 27, 2019