Lay out base design –
Generally, practical layouts of today should be using 1X2’s & Lauan panels (Door Skins)
with a T configuration Ladder frame.
Inexpensive, light weight and portable.
My modules only weigh a few pounds and built for strength with a “T” Ladder or grid configuration.
When I want to switch them out. I swap them out with others stored vertically in a walk-in closet. Freight or subway tunnels, which ever I would like to run that month.
Modules will hold those old overweight Lionel boat anchors as well as the light weight trains of today.
I used felt under the tracks and carpet padding underneath.
That’s it. Simple, strong & basic. No need to over engineer it.
Left the 2x4’s and heavy plywood design way back in the 60’s.
Don’t understand why people are still using that today?
S.