Found this thread and link on our sister forum, concoursmustang.com, to a bunch of pics of the Tarrytown, NY GM assembly line during 1959. Though it is not of Fords, still think it's pretty neat.
http://www.xframechevy.com/tarrytown-ny-assembly-plant-1959-chevrolet/
http://www.xframechevy.com/tarrytown-ny-assembly-plant-1959-chevrolet/