Just finished my track redo - 132 sections of n/s ez track. Try as I might, I cannot get rid of all the rough edges at the rail joints. I've very carefully made all the joints, swapped/replaced sections and rail joiners to get good fits, etc. Still have a few tiny burrs which trip up my steamie pilot wheels. Will sanding or filing the rough edges cause problems with the track? What is best to do the smoothing? Would filler between the joints help? What kind of filler? Help please. I'm a rank beginner trying to build a knockout layout for my grandson, and I think I have bitten off more than I can chew.