I'm no steam engineer, but my understanding is that these graceful loops are installed at intervals on a steam transmission line, to allow for metal expansion when steam is passing through. They also make an appealing abstract image -- to me, at least.
The folks in charge take a pretty dim view of civilians prowling around this place, because there's still a lot of heavy rolling stock moving around. While I was there, a freight train was being made up, as you see on the left above. The sounds of rail cars being coupled and uncoupled is a pretty impressive staccato drumroll. It's comforting to see that there's still some railroad activity around here. Maybe not what it was in the 1880s, but I'm not either.
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