The Rail at Aqueduct

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I just got done watching TVG from today(I dvr it while I am at work).
that was ridiculous.

the closest I ever get to a racetrack is the finish line boxes at Lone Star.
so can someone tell me exactly how a track gets in this condition, and more importantly, why it is so difficult for the track maintenence crew to correct the overwhelming bias.
Im sorry if this is a stupid question, but I am very ignorant when it comes to these matters.
Ive never worked around dirt before.
I understand how track biases work and can identify them, but Im just wondering how they are physically formed.



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