Southern Pacific 2472 is a P-8 Class 4-6-2 heavy "Pacific" type steam locomotive built by the Baldwin Locomotive Works for Southern Pacific Railroad (SP) in 1921. No. 2472 is one of three surviving Southern Pacific P-8 class 4-6-2 Pacific locomotives, the other two being Nos. 2467 and 2479. The 4-6-2 designation means it has four leading wheels, six driving wheels, and two trailing wheels. The locomotive was used by the Southern Pacific Railroad to haul passenger trains until being retired in 1957. The locomotive was then donated to San Mateo County and placed on static display at the San Mateo County Fairgrounds. After being restored to operational condition in the early 1990s, the locomotive would pull excursion trains on the Niles Canyon Railway until being retired in 2015. The No. 2472 was then moved to the Northwest Pacific Railroad, where it is as of 2023, undergoing its Federal Railroad Administration (FRA) mandated 1,472 day inspection and overhaul.

Baldwin Locomotive Works (BLW) was an American manufacturer of railway locomotives from 1825 to 1951. Originally located in Philadelphia, Pennsylvania, it moved to nearby Eddystone in the early 20th century. The company was for decades the world's largest producer of steam locomotives, but struggled to compete when demand switched to diesel locomotives. Baldwin produced the last of its 70,000-plus locomotives in 1951, before merging with the Lima-Hamilton Corporation on September 11, 1951, to form the Baldwin-Lima-Hamilton Corporation.