Here is a massive Lego Layout at the San Diego Train Museum.
I know what you are thinking. "This can't be any good!" All plastic, little locking parts and bits. How good could it be?
This layout is outstanding and believe me when I tell you it's worth the trip. The details on it are extraordinary. In a nutshell (and this is opinion, not by any means fact) the details make the layout. It isn't especially high rail, it can't be qualified as such. Details on a high rail layout are there to give it realism, some charm and to highlite or differentiate a place. The details on a Lego layout are for pure fun. And there are tons of them. They aren't hard to do and are very inexpensive. The technology of Lego really lends itself to doing amazing things on a train layout. And even further, the colors and textures are there. I'd have to say it reminds me of Tinplate in plastic. I don't think any of this is collectible in the sense of collecting old toys. However I do have to say that the trains ran quite well. I didn't see much opportunity to interact with them the same way we interact with a Lionel ZW and a huge standard gauge layout but the effect was similar. I did notice that even with four trains running simultaneously, there was almost no noise. The lack of sound was the only thing I found mildly disruptive, not because it was necessarily bad but because I am so used to a racket whenever any train is run (of any gauge). Some Youtube is coming as well!