I was looking at the area around Gold Hill in Google Earth and using the ruler available in that application, the horseshoe curve at the north end of the station looks to have a radius of about 350ft. If my calculations are correct, that's about a 16 and a half degree curve which is one helluva tight curve (we tend to define curves by radii in chains in Australia so forgive me if I'm not quite correct...).
Was this the tightest curve on the line or were there other similar curves?
While we're at it, what were typical grades on the Carson City - Virginia City section? Are there any grades/curve charts for the line still in existance?