The company's Mendocino Railway group operates the diesel- and steam-powered Sacramento RiverTrain (Woodland-Sacramento) and the Skunk Train (Fort Bragg-local).
Its historic western terminus has always been in Oakdale where a junction was once formed with both the Atchison, Topeka & Santa Fe Railway and the Southern Pacific.
The portion of the former Sierra Railway conveyed by the railroad's historic owners, the Crocker Family, to the California State Park System are with "Sierra Railway", which preserves the original operating name of the entire line and is headquartered at Railtown 1897 State Historic Park in Jamestown, California.
The Sierra Railway Company of California was incorporated on February 1, 1897 by founders Thomas S. Bullock, Prince André Poniatowski, and William H. Crocker.
In May, the first rails were laid in the grain fields just east of Oakdale, and the stops grew to include Occidental (Now called Arnold), Paulsell, Warnerville, Cooperstown, Chinese, and finally on November 8, 1897; Jamestown, California.