Look through these websites and books for more info:
Katherine Powell Cohen, Images in America: San Francisco’s Nob Hill. 2010. Arcadia Publishing.
Richard Rayner, The Associates: Four Capitalists Who Created California. 2007. W. W. Norton/Atlas & Company.
Iris Chang, The Chinese in America: A Narrative History. 2003. Penguin Books (Chapter 5, “Building the Transcontinental Railroad”)
David Howard Bain, Empire Express. 2000. Penguin Books.