It seems as though you have room for curves larger than O-60. Generally, a good rule of thumb is to use the largest curves compatible with space available and railroad activity. How much switching do you want to do? What industries do you want to serve? Do you plan to spot sleeping cars at stations and have the evening passenger train pick them up? How long will your passenger station be? On a spur? One or more tracks? Kindly give your reading public a hint as to what you want your railroad to do so members can build on that rather than wasting key strokes on a blank canvas. A diagram with dimensions and restrictions would be helpful.
John in Lansing, ILL