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Just last year the Union Pacific had just replaced Thousands of ties on the Blair and Boone subdivisons. After the Wood ties are replaced with Concrete ties,what does the Railroad do with the thousands of older Wood ties right after they have been replaced. Does Concrete last longer than Wood? Why do Railroads use Concrete ties on switch tracks since concrete ties can crack under the extream weight from the constant pounding from a heavy train. I thought that Wood ties would flex much better under the extream weight from the train. I have seen that most track with concrete ties don't flex (bounce) as much as the Wood ties. What gives? Plus with Wood ties,The rails are spiked,on the other hand,Concrete ties are cliped. Thanks,Allan.
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