Big Four.

About Big Four

"The Big Four" was the name popularly given to the famous and influential businessmen, and railroad tycoons — also called robber barons — who funded the Central Pacific Railroad (C.P.R.R.), which formed the western portion through the Sierra Nevada and the Rocky Mountains of the First Transcontinental Railroad in the United States, built from the mid-continent at the Missouri River to the Pacific Ocean during the middle and late 1860s.