That region is flat and has few physical obstacles to a rail line (like mountains, major inclines, major declines etc)
Getting a rail line between a major city (LA/San Jose/San Diego/SF etc) requires going through pretty serious mountain ranges. There is already rail line between them in their own geographical pockets (LA-San Diego, SF-San Jose-Oakland)
Getting a rail line between a major city (LA/San Jose/San Diego/SF etc) requires going through pretty serious mountain ranges. There is already rail line between them in their own geographical pockets (LA-San Diego, SF-San Jose-Oakland)