If you've taken Caltrain south from King St. Station, you go past the end of "Shit Creek" near where the tracks curve out of the station yard. It's the pretty little park, almost under the freeway, with the gaily muraled waste processing station. There's walkways up and down the creek, I don't recall any yards there.

Hey, you know what, checking www.justfuckinggoogleit.com for "muni graveyard" brought up a bunch of interesting shit.
Judging from the photos on kingofusagoestojapan.com/pix_g...ls.php this isn't near Shit Creek (Mission Creek), it's further up, maybe between 20th and 24th/Toxic Tire Beach.

I was checking out this area last month, thinking when it gets nicer it might be cool to do a UE photo safari around there... starting around 18th & Illinions there's a lot of interesting shit, there's a small, ruined waterfront park that I can't find on any online maps right now, and heading north from there there's a bunch of industrial areas and ruins of various sorts.

A-ha! bittercyclist.blogspot.com/2005....html says the best access to the Muni Graveyard is at 24th & Michigan, through Warm Water Cove park. I think that's the real name of Toxic Tire Beach. (You non-SF people must be getting a lovely picture from these local nicknames for our waterfront features.)

I bet I know where they're talking about, near TT Beach there's a great big empty building on the water that looks pretty easy to access. Fuck, I'm out of town right now, but if you were willing to hold off on checking this shit out till I got back (no more than a few weeks) I'd love to come with.