(click to enlarge) Photo and model of the caboose from which Pres. Harry Truman, with wife Bess and daughter Margaret, made his 1948 whistlestop campaign tour.
(click to enlarge) An armored limousine that conveyed Pres. Clinton.
These two exhibits are striking illustrations of how concern for presidential security has escalated in recent decades. Remember that Truman was a sitting president in 1948.