This Sunday's Bay to Breakers, which anticipates some 60K runners this year, will prompt extra public transit service on Sunday. BART will open two hours early and run extra long trains for the annual wacky race (as well as running longer trains for folks going to the Giants starting at 1:05 p.m.)
BART asks runners to "do their pre-race carbo-loading before arriving at the stations (i.e., no boozing it up) because there is no eating or drinking in the stations or on the trains.
Muni service will also start special event service from 5:45 a..m to 8 a.m. Behold: