MIL-HDBK-1005/6
Page
2.2.2
Frogs (Two-Rail Track System)..............
24
2.2.2.1
Rigid Frogs................................
24
2.2.2.2
Turntable Frogs............................
24
2.2.2.3
Materials..................................
24
a) Cast Turntable Frogs...................
25
b) Fabricated Rigid Frogs.................
25
c) Fabricated Turntable Frogs.............
25
2.2.2.4
Wheel Loads................................
25
2.2.3
Frogs (Four-Rail Track System).............
25
2.2.3.1
Rigid Frogs................................
25
2.2.3.2
Material...................................
25
2.2.3.3
Wheel Loads................................
25
2.2.4
Standard Gage Fittings.....................
25
2.2.4.1
Tongue and Mate Switches...................
25
2.2.4.2
Guarded Split Switch.......................
25
2.2.4.3
Railroad Type Frogs........................
25
2.2.5
Manual Calculations (Two-Rail Switch)......
25
2.2.5.1
Flangeway Spacing Computation..............
26
2.2.5.2
Circle Offset Computation..................
26
2.2.5.3
Linear Offset Computation..................
26
3.1
Applications...............................
29
3.1.1
Problem Description........................
29
3.2
Reduced Gage...............................
29
3.3
Crane Equivalent Length....................
29
3.4
Lateral Float..............................
29
3.4.1
Radius.....................................
29
3.4.2
Minimum Radius.............................
30
3.4.3
Float for New Cranes.......................
30
3.4.4
Transferring from One Track System to
Another....................................
30
3.5
Transition Curve (Inside or Control Curve).
30
3.5.1
Gage Reduction.............................
30
3.6
Switch Curve (Inside or Control Curve).....
30
3.6.1
Switch Alignment...........................
30
3.7
Main Circular Curve (Inner)................
30
3.7.1
General Requirements.......................
30
3.7.2
Selection of Radius........................
31
3.8
Complete Curve Combination.................
31
3.8.1
Transition Curve...........................
31
3.8.2
Tangent Length.............................
31
3.9
Reserve Curve..............................
31
3.10
Transition Curve (Outside).................
31
3.10.1
Central Angle..............................
32
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