Neither Google Maps nor Bing Maps is very up-to-date here, as far as I can tell. So I checked on TerraServer - Aerial Photos & Satellite Images - The Leader In Online Imagery.
It had images near Pittsburg-BayPoint from Feb 29, 2016, and I was able to follow the line eastward from there to Antioch. Most of the right-of-way seemed close to ready for tracks, if not ready for tracks. Some parts of it seemed to already have tracks in it, but it was hard to tell from Terraserver's freebie-images resolution. The Antioch station is a freeway-median station with an island platform, and the tracks continue a bit eastward, going northeastward underneath SR-4's northside lanes. At the end was a shop building and some yard tracks. SR-4's northside and southside lanes also approached each other about there.
It had images near Pittsburg-BayPoint from Feb 29, 2016, and I was able to follow the line eastward from there to Antioch. Most of the right-of-way seemed close to ready for tracks, if not ready for tracks. Some parts of it seemed to already have tracks in it, but it was hard to tell from Terraserver's freebie-images resolution. The Antioch station is a freeway-median station with an island platform, and the tracks continue a bit eastward, going northeastward underneath SR-4's northside lanes. At the end was a shop building and some yard tracks. SR-4's northside and southside lanes also approached each other about there.