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Reference image: http://members.cox.net/dbhuff/images/h&h03b.gif I will have (layout still under construction) a grade change from 2% to 5% at one point on my HO layout. My layout has a 2%, 20" radius helix for 240° going into a double curved turnout. The inside TO curve transitions to 2% up, this transition is about 2' in length then climbs for about 3' before leveling off . The outside of the double curve TO transitions to 5% down. This grade transition is about 1' in length and the 5% grade runs about 3' then goes back to 2% where the transition is about 2' or more. This short 1' grade transition is needed to "duck under" another track to get to the west-to-east return loop. Once completed, does anyone know if this transition is to short and will give me any problems or should I try to alter this somehow before I lay the track? I will be using Kadee couplers on both freight and passenger cars - era early '50's. Is there a recommended length for grade transition? I've looked on NMRA but can't find a reference.
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