We also learned a new word, from the notice alerts they flashed on the Now Arriving screens at our BART station of origin as we waited for a train to arrive: did you know that area by West Oakland where all the lines cross each other is called the "West Oakland Wye"? That's apparently where all the bottlenecking happened.
We did really appreciate the frequent updating on the status of the traffic jam, and the repeated apologies for the jerky stop-and-start movement from our sincerely-sorry-sounding BART driver this morning -- particularly during the 10-15 minute delay in the tunnel (we went through about 3 songs on the iPod while waiting). Take heed, MUNI! Everyone loves an explanation.