I am really starting to wonder if tearing out all my mainline flextrack andd replacing it with Unitrack and super elevated curves was such a good idea. I don't recall having so many problems with licking the points on switches and pilot trucks and leading drivers hopping the rails. Diesels are easy. THe trocks swivel in all directions. you all already know, big steam is another srory. Even identical steam locos act differently on unitrack curves. I probably should have started with a stronger frame and smooth plywood base for my roadbed. R ight now I have a 1"x4" frame with 2x2 cross members with 2" pink foam recessed down level with the top of the 4x4 in most places. Where elevation and inclines are placed I doubled up on the foarm and flexed it to gain elevation. I may be old but I am still learning.