Symbols and Nomenclature
Short tangent length between sharp end of outer Transition Curve and
beginning of outer main circular curve.
End of outer switch curve and beginning of tangent t1.
End of tangent t1 and beginning of outer Flexible Transition Curve.
End of outer Flexible Transition Curve and beginning of tangent t.
End of tangent t and beginning of main circular curve (on outer
Point of tangent to tangent (outer alignment where no main circular
curve is employed).
Degree of curve (central angle subtrended by arc of 100 ft).
Degree of curve at the end of the Switch Curve.
Degree of curve at T.C.
Degree of curve at any arc of the Transition Curve.
Distance of shift of outer transition curve along tangent at
S.C.T. to achieve reduced gage at circular curve.
Degree of curve of main circular curve.
Radius of flattest arc of Flexible Transition Curve.
Radius of sharpest arc of Flexible Transition Curve.
Radius of main circular curve.
Radius of switch curve (300' constant).
Length of switch curve (20.00 ft.).
Length of Flexible Transition Curve.
Length of Transition Curve (total length of Switch Curve and Flexible
All dimensions are given in feet, except angles are in degree -
minutes - seconds