Rookie question, I know. But I add a second loop on my layout and I need to know the gap I need at out of the turn with Atlas O-72 track, between the ties or the rails just to be clear with what we're talking about. Kind of gap to run 2 big engine like 4-8-8-4 or 2-10-10-2 locomotives. Thanxs for your help. (again!)
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