I have two new DCC fitted n gauge 2-8-0 engines.    My problem is that the front bogie wheels are so light that the jump the tracks at each set of points (not sure the American name for points I think possibly "Turnout).   The engines run fine in reverse though after a time the bogies are off the track.   
Does anyone else have this problem and what action should I take to keep the bogies on the track.   They are two pretty engines and it is a pity I cannot use them.   Any help appreciated.