San Francisco’s latest vision for South of Market preserves Interstate 280, gets rid of the Caltrain rail yard, and has the commuter rail line’s downtown extension bypass Mission Bay, instead dipping underground a mile before its current station at Fourth and King streets. A study to be released Monday, after 3½ years of work, significantly revises an idea raised by then-Mayor Ed Lee in 2013 to improve transit connectivity and create a new neighborhood. That plan called for rerouting Caltrain, and future high-speed rail trains, through Mission Bay to serve the growing neighborhood.

Source: New, simpler plan for SF’s downtown rail extension – San Francisco Chronicle