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concrete ties are also heavier than wood, this adds mass to the track structure making it more stable. as for the fence post comments most newer wooden ties, even on straight rail are in the 9 to 10 ft size. these are both busy subdivisions so I would doubt the ties were actually all that old, more likely they just got beaten down under the tieplates or cracked, either way, that messes with the line and crosslevel, leading to slow orders, broken rails, and sometimes derailments. concrete ties generaly don't have these problems (except as noted when there is a derailment). when mentioning the prestressing process, (depending on who made the ties), look on the ends of the tie and you'll just see the ends of the rebar.
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