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Can someone explain the term Substitution Radius in respect of turnout design for me?
Hi,
The term substitution radius refers to the radius that a turnout can be placed into without altering the radius.
Even though a turnout will have a minimum radius in its curvature, that does not necessarily mean that it will "drop" into that radius. For example, an HO scale #6 turnout will have a 43" minimum radius, but can be dropped into a 56" curve, according to John Armstrong in his "Track Planning for Realistic Operation" book.
Other substitution radii in HO are:
#4 29"
#5 36"
#6 56"
#8 110"
Hope this helps!
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