Lots of good advise on this thread. There is no universal right or wrong answer. As for me, I like my shelf to be as narrow as possible. My current shelf layout as a depth of a mere 16”. I will likely let that grow to 17” on my next build with 31” for the TT/RH area. (Note that the dimensions nicely match a ripped 4’x8’). Those dimensions allow for a double track main with a siding and then plenty of room for an Atlas TT. Admittedly, my layout aspirations are more limited than many on the forum. My focus is more on the trains rather than on a massive scenery/structure adventure that I know o will never finish.
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