don, while only have the 2 axel versions
I have read that the 3 axel version are indeed prone the very issue of rod breakage at the middle axel.
my thought, clean and lube. Obviously this can only help.
be meticulous about twigs and other stuff getting into the rods
I had the same issue with my 2085 rod breaking once due to a twig
both locos have an 'idle' middle axel, ie the axel rolls along and therefore stays in sync with the powered axels.
so, my guess would be not to overload, not to have excessive grades and anything else that might cause slippage, as once this happens the rod is taking real pressure, forcing the middle axel to rotate in sync via the rod instead of merely rolling along.
or, replace with a home made metal rod......those counter weight things are an issue too and I don't know how available they are-had the same with my Forney due to a spill, suffice it to say no counterweight and things become a complicated fix