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What diameter track do I need to run parallel to a quarter circle of O72 track. 

 

My lionel big boy has 2" overhang and a long propane tank car has 1 3/8" on a tubular O72 curve. So the tracks must be separated by at least 3 3/8", say 3 6/8"(propane less for larger radius).  Should I use a  O84, O96 or 108 curve to have tracks parallel?

 

Second, where can I acquire a half circle of tubular track in this diameter??

 

Third, assuming I cannot find this, how long a straight should I put between each section of O72 track to approximate this diameter?

thanks for help

stan

Original Post

0-72 for the outermost loop with a regular 0 gauge straight added for length should work. At the time I built my layout, no source of 0-84 tubular existed.

 

In the attached photo, the outermost loop and next loop inside are 0-72.  Center of the straight to the center of the second curve is roughly 5 3/4 inches.

 

   

layout002

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