Baldwin Locomotive Works built No. 2472 in 1921. Southern Pacific classified the 2472 as a P-8, along with 14 sister engines built from the same Baldwin order for 4-6-2 Pacific types. Its first assignments were passenger trains on the Overland Route between Ogden, Utah, and Oakland, Calif. When larger and more powerful Mountain type engines (4-8-2) replaced Pacifics on long runs, they were relegated to locals and commuter service on the San Francisco – San Jose run.
No. 2472 served for almost 36 years on the Southern Pacific. It was retired in 1957 and put on display at the San Mateo County Fairgrounds in 1959. There it sat until 1976, when a group of volunteers decided to restore it. No. 2472 is one of three surviving Southern Pacific 4-6-2 locomotives.