In case you'd forgotten that BART's tracks are in terrible, terrible shape, a snarled commute in SF today is here to remind you — a "reported deformity" on the tracks between Civic Center and 16th Street Stations means major delays for anyone trying to ride BART in or through SF Wednesday.

According to BART spokesperson Alicia Trost, the "deformity" was discovered shortly after 9:30 this morning. While crews repair the issue (an effort expected to take "5-6 hours to complete," Trost says), trains are single-tracking through San Francisco stations and trains traveling from the East Bay to SF next-to-nonexistent.

Trost says that the only East Bay trains that are running past Montgomery during the repairs are those bound for SFO, and that trains that normally run from Fremont to Daly City are stopping at the MacArthur station in Oakland, trains from Dublin to Daly City are turning around at Montgomery, and no trains are running directly from Richmond to San Francisco.

All BART riders are encouraged to seek alternate transit, Trost says. One option might be Muni, which is honoring BART tickets today.

Otherwise, be prepared for a very long, very slow ride.

Update 3:40 p.m.: Yeah, uh, this isn't good.

Also, there's a totally other problem over in the East Bay, some kind of equipment problem between the Bayfair and Castro Valley stations that has shut down service in both directions, leading to further delays.

Update 5:40 p.m.: It looks like BART is back up and running with just a 10-15 minute residual delay both on the SF lines and the Fremont line.

Previously: BART's Track Maintenance Problems Way Bigger Than Previously Reported