I've found a big big HO layout near me and posted about it here.
If anyone cares to view, I just found that there is a video of it:
formatting link
Day 285 of 365 Things To Do In Edmonds, WA
- Swamp Creek & Railroad Association
From earlier: Take a look:
formatting link
formatting link
Swamp Creek & Western Railroad Association
210 Railroad Ave. Edmonds, WA 98020