After reading the cover of the box for the expansion set, it states that it will expand any 18" radius circle. I don't understand why Bachman sells the starter set with 22" radius curves but the expansion set with 18". I had to return the expansion set and buy individual tracks to make my own layout. To further confuse myself, I bought all 22" radius curves to match my starter set curves and the other pieces the Bachman e-z track catalog said I needed on page 25. When the layout wasn't working, I looked at page 3 and it said 18" radius curves are needed. I just kept buying pieces until the ends met.

That's what SteamGene recommended. What does 4-8-4 mean?

Thanks for responding. I agree, I don't think they can be mixed. I think the store sold us the incorrect kit. It states on the box that it expands an 18" radius circle to the figure eight. I don't know if Bachman sells the same kit in 22" radius.

I just received the Overland Limited set for Christmas and also the EZ track 14 piece pier set. This set allows the oval to become an elevated figure 8. The original set has 22" radius curves and the addition had 18" radius curves. There are no intructions telling what combination of both make the figure 8. Can anyone help?

I just received the Overland Limited set with 22" radius curvesand the 14 piece ez track pier set with 18" radius curves to make an elevated figure eight. There are no instructions as to what combination of 18" and 22" curves to use. Can anyone help?