Bigger is always better, but it can be a big factor in choosing HO over S.? In fact one of the reasons that nailed my decision to go S over HO once I retired was the notation in the AM catalog that the equipment would run on 20R.
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It didn't take me long to decide to expand, but it was a crucial part of setting the hook.? ( you can also hide most of a 21" R in a tunnel or behind a view block and lead into it with something more gentle)
