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what superelevation is required on a 40 railway curve for zero resultant flange pressure on a car running at a speed of 64kph?

C. What is the resultant flange pressure on a 450KN car moving around this curve at a speed of 96KPH.
Gage G of the track is 1.50m. (A 40 curve is one whose chord is 30.5m)

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