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Yes, very intense pressure. They are trying to force the steel to expand in a way that it wouldn't naturaly (upwards rather than lenghtwise). That's why MofW has to be very carefull when changing out rail in the summer, as it will tend to "spring out" once it's released. The anchors are actually quite simple to put on..they just snap on. they can be put on with a sledge, but usually are put on by machine. The anchor itself isn't actually attatched to the tie, rather it is pressed up against it. one on each side of the tie, the 2 of them work together like a clamp, squeezing the tie and preventing the rail from sliding.
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