Trackwork Standards

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Item	NMRA O mainline	NMRA N hidden	NMRA M branchline
Minimum Raidus	17.5"	13.75"	12.5"
Minimum Easement	12"	9"	8"
Min.Turnout (single)	#5	#5	#5
Min. Turnout (x over)	#7	#6	#5
Spacing between Track Centers (straight)	1 1/8"	1 1/4"	1 1/8"
Spacing between Track Centers (curves)	1 1/4"	1 1/4"	1 1/4"
Length of straightaway in S Curve	6"	6"	5"
Max Grade (straight)	2%	2%	3%
Max Grade (curve)	1.25%	1.25%	1.50%
Min. Vertical clearance	2"	2"	2"

This page last updated on: January 05, 2009.
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Copyright 2007 by Scott CR Henry.

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