I have sent this post to 3 forums and no one has answered. I cannot order my tracks until I get the answers. It is holding me up from finishing my setup. Please someone out there must know what I am talking about and can help. 1. If I am going to be using the 23-046 double track viaduct incline pier set, do I have to also use the 20-003 double incline track plate between the double viaduct track and the 20-001 double straight track plate? If this is true, then I would need to buy two of the 20-003 incline track plates because my train will be descending as well as ascending right? Why can' I just go from viaduct track to 20-001 straight plate track? 2. Does 23-046 double incline pier set include a set of piers for descending as well as ascending or do I have to buy 2 sets? 3. Does this pier set also include the S-Joiners?