As the “Obama Express” pulled into Baltimore on Saturday, I was looking up what kind of train he was riding on. The Obama and Biden family rode in the Georgia 300, a rail car built by Pullman in the 1930s. Built for railroad executives on the Southern Railway, Jack Heard purchased it in 1986 and refurbished it into a plush, shiny blue car suited for the ultimate chief executive. Several presidents and presidential candidates have leased it previously for campaign trips, Obama included. Ahead of the Georgia 300 on Saturday were (less cushy) passenger cars for staff and guests, Secret Service, press, and food service. Two Amtrak diesel engines pulled the 10 cars. The train was outfiited by Waav with wireless Internet.