Hmmm.... Your post leaves out some of the details.
Here is *my* viaduct. It is scratch built, and about the best that I am able or willing to do. Rather clunky for a "real" modeler, but the price was just right.
The Route of the Broadway Lion The Largest Subway Layout in North Dakota.
Here there be cats. LIONS with CAMERAS
Take a look at Vic Smith's City Edge layout. There is some very nice elevated viaduct there (along with other fantastic things).
http://www.youtube.com/watch?v=0A2h3jZhxiA
Jim - Preserving the history of the NKP Cloverleaf first subdivision.
Nice. I wish I could build a city like that. I thought I was back in NYC again. Well except for the equipment, none of that stuff could run in New York.
But alas... I will never have that much money.