The Niles Canyon Railway (NCRy) is a heritage railway running through Niles Canyon, between Sunol and the Niles district of Fremont in the East Bay of the San Francisco Bay Area, in California, USA. The railway is listed on the National Register of Historic Places as the Niles Canyon Transcontinental Railroad Historic District. Trains are operated 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.