I just picked up a Bachmann N scale train set. I would like to duplicate my HO layout in N scale. My HO layout uses 15", 18" and 22" radius curves. N scale track is available in 11 1/4", 12 1/2", 14", 15 1/2", 17 1/2" and 19" radius. Is there a chart that shows how to convert HO to N? I don't want to have to buy a bunch of track in each radius just to be able to pick and choose what fits.