Prior to Air Force One US Presidents traveled in a bad ass armored train called the Ferdinand Magellan
US Car Number 1, the Ferdinand Magellan, sits in the Gold Coast Railway Museum in Miami. It's 120 tons of bulletproof, armored railcar: a train carriage designed to move the President of the United States around the country in safety and style. (At least, it was, until other transport came along to do a better job.)