@shane333 One of the cool things about FastTrack is that you can do quite a bit with different radius curves and still have the layout work out in a smaller space. I think you have the space to make your outer loop O48, or even a combination of O48 and O60 curves. You can mix and match curves to try and create a wider, sweeping curve. As long as the angles add up to 180, you are good to go. 
This would shorten your straight runs, and you "waste" a little extra space in the corners due to the wider curves, but the trains running the outer loop will look pretty nice on a wider curve. Something to think about, in my opinion. You could also keep the S-curve that you added at the top of the layout, which I like for some added interest and to squeeze some station platforms in, but do it with wider radius curves so that the derail risk is minimized/eliminated.
I just played around with this using wider radius curves on the outer loop and some tweaking to the S-curve at the top. This is still a little sloppy and there is room to make this more symmetrical, improve the yard entrance, etc. Or do a crossover at the top instead between the loops, and a passing siding at the bottom for the inner loop.
In summary - if you had interest in using curves beyond O36, your table size, particularly that 62" width, gives you some options.
