Based on my experience, especially with today’s scale sized engines, cars and cabooses, you really need a minimum of 6” clearance from rail top to the bottom of the upper level sub- roadbed. And you want to limit your grade to no more than 3% ( 3” per 100”) plus at least a couple of feet of transition - gradual grad e until you reach the 3% grade) to avoid problems with loco pilots and loco length.
just as a side note, I’ve been working on redesigning my plan because I’ve learned that I really can’t work on track when it’s is more than 28” away from me due to short arms and a gut. So I’ll need to narrow my layout to accommodate that limitation. I only mention this so that you take any similar limitations into account.
Thanks again to everyone in the group for their help and insights.
Rubin
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