I am starting a lay out & some of the silver E-Z track pieces are a better radius for the 89' Thrall Bi-Level Auto Carrier & Bachmann EMD DD40AX Centennial I purchased. The DD40AX says it works better on at least a 22 radius and the auto carrier needs a 24 radius. My DCC E-Z command set has 18 rad curves and 22 rad curves are available in steel, but to go any further on the radius Bachmann Nickel Silver E-Z track is all I have found.