CEMP-E
TI 850-02
AFMAN 32-1125(I)
1 MARCH 2000
Figure 6-28. Turnout Design
h -t
sin S =
Eq 6-12
a
S = Switch angle (degrees).
h = heel spread (inches). (Standard dimension is 6.25 in.).
t = thickness of switch point (inches). (Standard dimension is 0.25 in.).
a = length of switch point (inches).
1
C =q
Eq 6-13
(F + S )
sin
2
C = Long chord (feet).
q = g - e - h (feet), where g is track gage, e is frog toe spread from AREMA Plan 910, Column 21, and h is
the switch heel spread distance (which has a standard value of 0.52 ft).
F = Frog angle (degrees), from AREMA Plan 910, Column 17 (converted to degrees).
S = Switch angle (degrees).
C
R≈
Eq 6-14
2 sin 1/2(F - S)
R = Radius of curved closure rail (feet).
C = Long chord (feet).
F = Frog Angle (degrees).
S = Switch Angle (degrees).
6-46
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