I'm not familiar with any surveyed Espee line through the Ridge Route / Grapevine area; however Santa Fe did survey a line in 1923, from Bakersfield to Los Angeles via Grapevine Cyn. & Piru Gorge to Castaic, then basically the current I - 5 route through Newhall & San Fernando to Los Angeles. This route would have required 16 tunnels, including a 17,600' one to exit the South end of Piru Gorge ( I - 5 & Templin Hwy. area.) Many tall & long steel viaducts were also called for in the climb up Grapevine Cyn. Santa Fe was serious enough about this route to buy key parcels of land in Gorman & Lebec to secure the portals of the summit tunnel. Note that this line, if built, would now be under Pyramid Lake. Info from Signor's Tehachapi book.