The current MSI layout is spectacular and very popular - featuring Amtrak and BNSF - though I miss hanging around by the big relay cabinet at the end of the previous O gauge Santa Fe layout, hearing the relays and switches buzz and click.
As to 'coolest', I have always been partial to some of the 'original' post war model railroading layouts: John Allen's Gorre and Daphetid RR. and Frank Ellison's Delta Lines. And certainly the big Lionel NYC showroom layouts...
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