I'm in the layout planning stages and I have a couple of curves that are 13.75" radius. Will this cause problems for my Kato Dash 9's and SD70MAC's? If so I'd rather fix it now than after I have track in place. I'll be using easements so that will help, but I still want to know before I start laying track. Also....even though I've also asked this in another thread....will these locos negotiate the PECO small radius turnouts (12" radius)??