Certainly state-of-the-art when she was built in 1904, locomotive 3025 sped along the Southern Pacific’s California “Coast” and “Valley” lines for nearly 50 years.   In the 1940s, she might be found pulling trains over the Sunset and Golden State Routes in southern Arizona and New Mexico as well.   During the 1920s, No. 3025 and six of her sisters were rebuilt with the addition of a “booster engine” – an unusual extra-power feature that is mounted on the axle of the trailing truck, directly beneath the cab.