I have an R1 and an R2 loop, oval actually with straight sections between. I would like to connect them along the straight section. Looks like I am going to need either 2 left hand switches, or 2 right hand switches. My question is what radius switches to use to keep the inside loop centered? I'm using 300mm straight track. How long is the straight portion of the switch? How will the two switches line up along the length? Thanks.