Nev, don't fret, these guys are fine. Tell Bob Comerford I said hello! I know he visits here but haven't seen him on in a while.
I think I have a problem...When I contacted Brad Strong at Signature Switch about making my #6 switches I told him I was still running Hi-Rail wheels on all my equipment. He told me he could changed something to handle that during the construction of the switches, but I could never see what he had done.
There appears to be a thin brass(?) shim on the inside bottom of the frog, I'm assuming he made that thinner to account for the pizza-cutter flanges on the Hi-Rail wheels. Using the IM wheelsets I'm getting some derailments, which I believe are caused by the IM flanges dipping down in the frogs
Doesn't happen all the time and doesn't happen with all of the 6 cars that I've got the IM wheels on. Funny thing is on the mainline no matter what speed I don't get any derailments, but when moving thru the sidings it happens. It may be the brand of truck on the cars in question. I'll have to try identifying the trucks to see if I simply need to replace the ones that are giving me problems.
I can't add shims because of the Hi-rail wheels on my engines, man what a system I have created for myself!
So long story short I have to hold off buying more wheelsets until I'm sure I can fix the problem. I may have to go back to Hi-Rail wheels on these 6 cars, didn't have ANY problems before the swap.