i am a big lover of curving track. just returned from a cz journey that was 8 hours late crossing eastern nevada so we got to see the nighttime portion in the daytime. previous to this, the horseshoe at the bottom of cuesta pass on the cs going into slo was my favorite. but after seeing and riding the arnold loop going up silver zone pass in the mountains of eastern nevada i hold this as "big-time railroading at its finest". what is your favorite spot of curvy tack?