Tehachapi Mountains

At the heart of the financial and deadline challenges facing the $68 billion high-speed rail project are 36 miles of tunneling north of Los Angeles, according to Los Angeles Times analysis that includes interviews with experts on mega-projects.
Oct 28, 2015   Los Angeles Times
Given its unprecedented “scale and scope”, California's bullet train poses a plethora of complex challenges to engineers and train planners, reports Ralph Vartabedian, yet it also seizes their imaginations.
Nov 14, 2012   Los Angeles Times