like eric m, i sanded the ninco track. first with an electric vibrating sander, but it got the plastic to hot and wouldn,t touch it. so it was all done by hand with a cork block and 80 grit silicon carbide paper. it turned into a long task and the best you can do is knock all the high spots down. i then literally flooded the track with an acrylic silk paint. i made the inner and outer borders from 9mm mdf painted with the light gray acrylic paint. this was on a standard ninco track. if you want to remove the bump on the borders, i would use a 4in rotary grinder with a coarse floppy disc and light pressure, change the disk to a finer grade and finish with the 80 grit on a rubbing block. the length of a piece of track is dead easy to change. cut out the piece you dont want glue the track back together and solder some wires across the break, it wont melt the plastic if you tin everything first. its important to make an insert [copper brass] for the slot, to hold the plastic in place whilst soldering. john