President Harry Truman embarked on a Whistle Stop Tour in 1948 to bolster his re-election efforts, stopping in small cities and rural communities where he would deliver speeches from the train platform to large audiences.
Source
Truman Presidential Library. "President Truman on the platform of a train to Fulton, Missouri." March 5, 1946. (24 January 2006); also Truman Presidential Library. "President Harry S. Truman speaking from a train on the campaign trail in 1948." 1948. .(24 January 2006).