Columbia River Belt Line 7, also known as Skookum, is a preserved 2-4-4-2 Mallet-type steam locomotive built by the Baldwin Locomotive Works in 1909. It was used to pull logging trains in the Pacific Northwest, until 1955, when the locomotive fell on its side, and it was abandoned. Several decades and ownership changes later, No. 7 was restored to operating condition in 2018. Presently, Skookum is owned by Chris Baldo, and it is being used to run on occasion for the Niles Canyon Railway.

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.