Authored by railroad historian Thornton Waite, Union Pacific Rails to the Mines: The Boise, Nampa & Owyhee Railway details the ambitious and financially volatile history of the late 19th-century rail line that connected southwestern Idaho's rich mining districts and agricultural valleys to the broader transcontinental network. The book traces the corporate maneuvers, engineering challenges, and economic battles required to construct and operate tracks through the rugged terrain between Nampa, Boise, and the Owyhee mountains. Drawing heavily on corporate archives, vintage maps, and historical photographs, the text illustrates how steel infrastructure dictated the survival and decline of regional boomtowns. A keen insight drawn from the work is how regional feeder railways acted as economic gatekeepers rather than mere public utilities; by holding a monopoly over mineral and crop transportation, independent lines like the Boise, Nampa & Owyhee held the ultimate power of life or death over local commerce, frequently leaving isolated communities at the mercy of distant corporate boardrooms.