Who are these famous railroad investors?

I know Leland Stanford, and Collis P. Huntington were two of the "Big Four" or big business investors, and were financially heavy investors in the Central Pacific Railroad, and the Transcontinental Railroad. Here's the link to WIKI for the detailed informationa href="http://en.wikipedia.org/wiki/Leland_Stanford" rel="nofollow"http://en.wikipedia.org/wiki/Leland_Stan…/a