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[quote user="NWP SWP"] I highly doubt .017 inches will seriously impact anything, let alone anyone noticing.[/quote] Considering the spec is +/- .017, you could have problems with an already low car. <a href="https://www.nmra.org/sites/default/files/standards/sandrp/pdf/s-2_2010.09.pdf">https://www.nmra.org/sites/default/files/standards/sandrp/pdf/s-2_2010.09.pdf</a> Trip pins will be the first thing that causes problems, usually catching on turnouts or grade crossings.  Uncouplings may or may not happen, depending on how smooth the transistion between level and not level track is and if the couplers are all the same height. That said,  I put intermountain 33" wheels on all my accurail cars and had no issues.  Those IHC cars look like they have 33" wheels from your pictures.  It will just depend on how you mount the couplers.
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