Jay, there's what's described on Kelly's site as "Prototype frame detail machined into the underside of the frame" which makes it deeper than the Des Plaines brass plate. I'm not sure its exactly prototypical side-frame depth, but it helps to fill the gap where the real thing would have the side frames visible, especially if you're modelling a later GP9 with cut away side skirts. I seem to recall that the first batch didn't have that (or the ditch light wire channels) but don't quote me as I only have the later versions myself.
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