Mike,
Thank you.
John

I have read articles referring to weight tables specific to engines and rolling stock. Are there any such tables available for HO scale products ?

I have several Bachman engines that derail crossing turnout switches and crossovers. It appears that the drive truck spring is too weak to reposition the truck after contact with the turnouts or crossovers, I have other engines from different manufacturers that do not have this problem. I have thought about replacing the springs with stronger springs. Is anyone else having this problem and if so what are your recommendations.