With an easement the diameter/radius of the curve remains the same--what is changed is the transition from the straight track into the curve. There are many techniques to lay out easements. One approach with sectional track is to use several different diameters leading into the main curve--not optimal but easy to implement.
Obviously you'll need a bit more real estate for the curve but the will be better both visually and operationally--"easing" into the curve.
