Thank you guys! Just decided to check this to see if any new information.
j2morris - Exactly the info I have been hoping for Thank You Very Much! Believe it or not was thinking of using 45" radius if I could, so your post definitely helped me.
I had started planning my layout and one mainline was going to be 45R the other 49.5R That is the max I can comfortably fit in the space I have to work with. 54R is just is a little too close to the walls!