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I can not fathom why wheels in gage would move out of gage.  There arenot enough forces in play to move them out of gage.  Are you talking steam engine drivers or what.  Steam engine going out of quarter I could see but out of gage, no. 

Rolling stock  wheel sets should not move out of gage,  they are hard enough to move into gage so going out of gage over time is surprising.  It would be more like  they were out of gage from the start.

Marc Fournier, Quebec

Sometimes I notice that the

Sometimes I notice that the friction fit can be quite loose on some trucks and gears. I am not talking about steam locos. I am surprised as my experience tells me otherwise that the fits can be loose and need adjusting sometimes. This is not an ongoing process but it does happen. And I can assure that before any piece of equipment goes on the layout it gets gauged. So what gives?

Steve Pirosko

Half axles

I suspect the original post was asking about half-axles on diesels which are often press fitted into a gear. I've seen some diesels where the press fit wasn't particularly tight.

As far as gluing them goes, my impression is that the gears are made of engineering plastic. If this is the case I don't know of a glue that would adhere to that stuff. You might try Loc-tite if you're really concerned. I've not noticed them problem with any of my diesels (but I've not gone through the layout looking for it, either).

Cheers,

Charlie