Here's the link to the article
https://www.theloopnewspaper.com/story/2017/06/10/local-news/moving-mountains-to-ease-train-traffic-jams/3631.html?m=true
I've read that they have started double tracking part of the Tehachapi over the last 7 years. Since the state pays for part of the upgrade, wouldn't it make sense to allow passenger trains on that route that could connect up with the future high speed rail in Bakersfield?