MIL-HDBK-1005/6
TABLE 4
Symbols and Nomenclature
Definition
Symbol
Ln
Length along Transition Curve from T.S.C. to any P.C.C.
As
Length of arc of Fixed Transition Curve (Switch Curve).
An
Length of arcs of Flexible Transition Curve.
)n
Central angle of circular arcs of Flexible Transition Curve.
)
Intersection angle of main control tangents.
)c
Central angle of main circular curve.
Central angle of switch curve (3E 49' 11").
2s
2n
Central angle from T.S.C. to any P.C.C.
2a
Central angle of Flexible Transition Curve (S.C.T. to T.C.).
2
Central angle from T.S.C. to T.C.
M
One half the distance between the parallel tangent tracks.
N
Number of Arcs of Transition Curve Constant (Eq 1 and 2)
n
Any point of Compound Curvature.
X
X-coordinate to point n on inner curve.
Xc
X-coordinate to T.C.
Y
Y-coordinate to point n on inner curve.
Yc
Y-coordinate to T.C.
W
X-coordinate to point n on outer curve.
w
Total number of wheels of crane.
Z
Y-coordinate to point n on outer curve.
PIa
Point of intersection of main control tangents.
NOTE:
All dimensions are given in feet, except angles are in degree -
minutes - seconds
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