Fox Valley sent me a piece of there flex track and a #5 switch. The tie thickness on the shs track is double that of the fox valley.
Here is the shs flex with the #5 switch 
Here is the fox valley flex and #5 switch
I am waiting for the mth flex track to do the same test. Now I understand with rail joiners it should raise the rails to the same height
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As you see it does, but this still leaves a gap between the tie thickness and base of platform. I want to keep the fox valley switches.
I figured if I use the middle #5 switch, I would be able to run everything through them. The longest engine I will be running is my AM E8A diesel.
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So I am asking all of you in S, what are your thoughts, suggestion. For those of you that have these fox valley #5 switches, do you have any derailments going through them with the tie thickness. Is your track pulling up over time because of this. The tie spacing is different too, shs has 43 to fv 41.
This will be my final layout build, so for once I would like to get it right the FIRST time.