Early SP intermodal train By Angela Cotey | February 19, 2016 | Last updated on January 6, 2021 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates An A-B-A set of F units departs San Francisco with Southern Pacific train 372, the piggyback-heavy Advance Overnight for Los Angeles, in August 1955. William Harry photo