By Holly Quan

SAN FRANCISCO (KCBS) — The San Francisco Municipal Transit Agency is investigating the derailment of a Muni streetcar in front of the West Portal Station early Friday morning.

The incident happened about 5:30 a.m. when an inbound L Taraval train’s wheels came off the track as it approached Ullola Street—right in front of the entrance to the West Portal tunnel.

The problem, officials on the scene said, may have been caused by a switch signal which hangs above the street—the switch controls which way the wheels should turn.

No passenger injuries were reported.

While the light-rail service was restored within an hour, the schedule was off. A Muni supervisor said they were going to keep bus shuttles in service though the commute to alleviate pressure for the inbound line.

(Copyright 2013 by CBS San Francisco. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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