It would appear that the Atlas/Kato GP30 did not have truck mounted couplers, as per Mark's page. The Atlas/Roco however did.
http://www.spookshow.net/loco/atlasgp3035.htmlAnyways. I have a new set of Kato rails coming and when I get the MT conversions, I will do what it takes. I'm sure it won't be a big deal, and will
certainly be better than the previous owner's hack job. I mean the couplers he screwed on barely line up with others, and at the slightest hint of
track uneveness, come undone. Like I said, good for a laugh.
Being that this would be my first pilot conversion on an RS11 though, I was surprised that it has to be screwed. My previous experience is with L/Ls GP18
which are simply glued in place, and much like CATT's observations, have pulled as much as 18 cars, with no hint of seperation.