Track layer named Alberto Rodriguez

From: "Isela Ponce De Leon" poncedeleon@adelphia.net

... I am working on my family tree and recently found out that my grandfather Alberto Rodriguez worked laying out the rails for the train  back in 1910-1930?  He was immigrant from Mexico and wanted to know if you are able to let me know where I would be able to find his name.  ... how I would go about finding more information on him.  I don't know what railroad it was, but, he worked in San Francisco all the way to Mexico.