Easement Templates for HO scale
PT is point of tangency.
D is circular curve offset from tangent-line.
Ypc is offset where spiral meets circular curve.
For details see:
Mallory's _Trackwork Handbook_
Armstrong's _Track Planning for Realistic Operation_
Transition Curve Explanation
- from rec.models.railroad
Easement Templates for HO and N scales.
Postscript Template for R=18 inches, L=5 inches.
Postscript Template for R=24 inches, L=6 inches.
Postscript Template for R=9 inches, L=2.5 inches.
Postscript Template for R=12 inches, L=3 inches.