Though small in geographic size, Placer County is large in its rich history of railroading in California. This book covers 14 different railroads that did or still do exist in some association with Placer County. There were narrow-gauge and standard-gauge, long transcontinental, and short point-to-point railroads. Some railroads were fully contained within the county, and others just touched the county. Some railroads were short-lived operations, while others operated for decades. One railroad still functions today, undiminished after 150 years in service. This book is more than just a collection of photographs of locomotives; it provides the reader with a visual history of various aspects of the many railroads operating in Placer County over the years.

The Central Pacific Railroad was the first railroad to enter Nevada County as it constructed eastward in 1865. At the base of the eastern slope of Donner Pass, the railroad established a construction camp, now known as Truckee, before following the Truckee River to the Nevada state line. Truckee became home to expansive locomotive facilities for helper locomotives on trains westbound over Donner Pass after the completion of the Transcontinental Railroad. Through the end of the 19th century, additional railroads were constructed, bringing the outside world closer to the remote corners of the county. Railroads like the Nevada County Narrow Gauge Railroad and Nevada County Traction Company served the gold rush-era boomtowns of Grass Valley and Nevada City. Lumber companies like the Towle Brothers and the Sierra Nevada Wood & Lumber Company brought rail into the forests and filled the demand for lumber throughout the region.