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<p>Unless Im reading your drawing incorrectly you have less than 3 in of separation between railheads (I see 2 31/32).  Thats not going to work out very well for HO scale.  You need at a minimum 3in of separation.  With 22" curves you would need approximately 2.1% grade over 12 linear feet of track (one direction), less since you are going steeper 3% is 8ft of track. These of course are approximate numbers obtained from John Armstrong's book.  You will probably need more than 3in of clearance for running certain modern equipment. </p>
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