Posted by W. D. Shaw on November 7, 2010 
Well worth the effort, Georg. Nice shot!
Posted by ChevelleSSguy on November 8, 2010 
It looks like a prototype helix that we model railroaders would use.
Posted by James Burlington on November 8, 2010 
Are there any spiral viaducts in the United States?
Posted by steam_marc on November 8, 2010 
James, if you mean something that looks like this (where there is a bridge over the lower track), then I can't say that there is. However, Tehachapi Loop does this, as do the Spiral Tunnels on the CP, if that helps at all.
Posted by S&C Editor on November 14, 2010 
Don't forget the "Hiwassee Loop" near Farner, Tennessee. TVRM operates trains over the line.
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