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I have several pieces of two different sized RealTrax curves there is about a half inch difference in the two sizes.  My question is how do I figure out what size curves they are so I can buy enough pieces to make a circle?  I'm guessing they are 31, 36, or 42 but don't know how to be sure.  They are solid rail tracks.

any advice would be appreciated as I have never had MTH tracks before these.

Thanks, Nick

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Nick :

   Measuring along the outside of the center rail

O-31  11 ¼  inches       8 to a circle     older track marked with a letter A or B( may be other letters) on bottom , newer O 31

O-42  10 ½  inches      12     “                usually marked O-42 on bottom

O-54  14 ¼  inches      12     “                usually marked O-54

O-72  14 ¼  inches      16     “                older track not marked on bottom ,newer O72

O-82  16 ¼  inches     16  to a circle     all marked O-82 on bottom

  To assemble and disassemble the track correctly     http://mthtrains.com/news/081    click on the picture. You can also search the forms for instructions. Hope this helps.

         Galon Tonell

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