The Pacific Locomotive Association, Inc. (PLA) is a non-profit organization dedicated to the preservation of the physical aspects and atmosphere of Pacific Coast railroading during the period from 1910 to 1960.

The Niles Canyon Railway (NCRy) is a heritage railway running on the first transcontinental railroad alignment through Niles Canyon, between Sunol and the Niles district of Fremont in the East Bay of the San Francisco Bay Area, in California, United States. The railway is listed on the National Register of Historic Places as the Niles Canyon Transcontinental Railroad Historic District. The railroad is operated and maintained by the Pacific Locomotive Association which preserves, restores and operates historic railroad equipment. The NCRy features public excursions with both steam and diesel locomotives along a well-preserved portion of the first transcontinental railroad.