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Old 06-20-12, 01:26 PM
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Drew Eckhardt 
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Originally Posted by bigfred
Probably the manganese. As the diameter of rails is fairly constrained, there is no opportunity to increase the volume of titanium used in order for it provide strength equal to that of steel.
Carbon rails are usually oval shaped and taller than steel rails.

With beam stiffness proportional to the cube of height that re-shaping should work well for titanium too.
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