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IF the layout is for you, chest height is prime.
IF the layout is to show off for kids, 36" to 48" is prime.
I don't know about the NMRA, but you'll get a wide range of opinions here. It boils down to your personal preference. The biggest advantages IMHO:
Higher: More realistic viewing level. Easier to work under the layout, especially for those old joints.
Lower: Better viewing level for children, without resorting to stools, steps, holding.
I am 5'-6" tall so I set the surface of my layout at 40" from the floor. Make the height of your layout suitable so you can reach things, especially switches, and for good viewing.
It's all about personal preference.
I'm currently building a 3'x 12' shelf layout along one wall of a bedroom at 52" elevation. That's a bit high for most people, but I want to maintain clearance under the layout for other furniture including a dresser and work table. I like to see trains at chest height when I'm standing. Wider tables need to be lower for access.
If you haven't built a layout before to establish a personal preference, mock up some table surfaces at different levels with some tracks and trains so you can get a feel for what best suits you and other family members.
Ace,
The mockup suggestion is an excellent one. I made a mockup by shimming a card table with books to various heights. The benches on my layout are 3' wide x 40" high x 6' long.
It is truly your choice. There is no standard. I like 40"-42".
.....
Dennis
I've always used 39"- 40" as a standard. Just high enough to get under if you need to, and not too low for comfortable viewing. I think this varies with the personal likes of the individual.
37" perfect for me.
Is this a wide Island Layout or a narrow against the wall layout?
Do you plan to often climb on the layout.
The good height to choose is 36" to 40".
Andrew