Equipment problem stalls N-Judah train in SF’s Sunset Tunnel

A Muni N-Judah streetcar turns around at La Playa Street for a return trip downtown in San Francisco, Calif. on Thursday, Aug. 27, 2015. Muni is getting ready to roll out a second round of major service improvements systemwide. less A Muni N-Judah streetcar turns around at La Playa Street for a return trip downtown in San Francisco, Calif. on Thursday, Aug. 27, 2015. Muni is getting ready to roll out a second round of major service ... more Photo: Paul Chinn, The Chronicle Buy photo Photo: Paul Chinn, The Chronicle Image 1 of / 1 Caption Close Equipment problem stalls N-Judah train in SF’s Sunset Tunnel 1 / 1 Back to Gallery

An Muni N-Judah streetcar was stuck in the Sunset Tunnel in San Francisco for more than hour Thursday morning snarling the commute for hundreds of riders.

At about 7 a.m. an equipment issued in the Sunset Tunnel caused the delay in service of the N-Judah, according to Twitter posts from officials of the transit service. A shuttle bus was quickly set up take stranded passengers from Carl Street and Hillway Avenue to Church Street and Duboce Avenue.

About 9 a.m., the tunnel was cleared and regular service resumed, but Muni warned riders to expect residual delays.

It was not immediately clear exactly what the equipment issue was.

Bill Hutchinson is a San Francisco Chronicle staff writer. Email: bhutchinson@sfchronicle.com Twitter: @bill_hutchinson