==Still a stub== 

 This article is still only 5 sentences long.  In my view, that is a stub, so I've restored the stub templates onto the article.  I know there is a ton of information that could be added to this article on the railroad significance alone (entire books have been written on this subject alone, such as Chard Walker's 1978 volume Railroading through Cajon Pass ASIN B0006CZTKI). A quick Amazon search shows 26 different books with "Cajon Pass" in the title.