The video below shows a multi-part machine which lays high-speed railroad tracks. The video was shot in Europe but a similar machine is being used to lay tracks on the high-speed rail line between St. Louis and Chicago. According to the source that I saw, these are the only two such machines that exist in the world. It's quite an operation. Give it a look:
[A "Hat's Off" to my sister-in-law, Peggy, for bringing this to my attention.]
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