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[kek166@comcast.net]

I am interested in putting a track within my current   42in round  18 radius track    How do you figure out how many track pieces and the radius to use

[Terry Toenges]

If you are using E-Z Track, the only radius option is their 15" radius. It takes 12 pieces to make a circle.

[jward]

I am interested in putting a track within my current  42in round  18 radius track    How do you figure out how many track pieces and the radius to use

If your track is 42" wide already, you should be able to put another loop of 18: radius inside what you have. Overall, an 18r circle should measure about 38" over the end of the roadbed. If you can do this it would be a much better solution than using a sharper curve like 15" radius.