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The safe speed on transition curve of B.G. track can be calculated by using formula :1. \(4.35 \sqrt{(R-67)}\)2. \(4.4 \times\sqrt{(R-67)}\)3. \(3.65 \times \sqrt{(R-6)}\)4. None of the above |
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Answer» Correct Answer - Option 1 : \(4.35 \sqrt{(R-67)}\) Concept: As per martin’s formula, safe speed can be given as follow: a) For low speed (< 100 kmph) (i) On a transition Curve: Depending on the radius of the curve (in meter) and the speed for transition curves can be given by Martin’s Formula, For Broad Gauge and Meter Gauge: The safe speed on the transition curve \({V_s} = 4.35\sqrt {R - 67} \) km/hr or \({V_s} = 4.4\sqrt {R - 70} \) For Narrow Gauge: The safe speed on the transition curve \({V_s} = 3.65\sqrt {R - 6} \) km/hr Subjected to a maximum of 50 kmph. (ii) On a non-transitional curve: 80% of the above-given speeds for respective gauges. b) For High speed (> 100 kmph) \({\rm{V}} = 4.58\sqrt R\) kmph |
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