The central angle of the flexible transition is:
2a = 2 - 2s or,
(D1 % Dmax)
Xn = Xn-1 + Rn (sin 2n - sin 2n-1)
Yn = Yn-1 + Rn (cos 2n-1 - cos 2n)
Note: 2n, Xn, and Yn are used herein to designate
angles and offset distances from the T.S.C. to the
points of compound curvature only. They are not used
to designate angles or offsets to any arbitrary point
on the transition curve.
The tangent distance for the complete curve is:
T = Xc - (Rc sin 2) + (Rc cos 2 + Yc) tan )
This curve is identical with the switch curve
(inside or control)
The lead is:
ts = G sin 3E 49' 11"
Gs at the S.C.T., by convergence of outer and
inner rails of switch curve is:
Gs = G cos 3E 49' 11"