I just completed this segment for my DVD I'm making. The Missouri Waltz playing in the background came from a 1916 recording loaded with typical old recording noise I was able to clean up. Also I added croud noise and created the train sounds. the video came from short clips from a PBS broadcast.
This little piece took the better part of the day to assemble. The tricky part was removing the origional audio except for when President Truman was speaking. Truman actually hated the Missouri Waltz but the bands played it wherever he went.