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<P>I guess what I am wondering is why they would be needed as an attention getting device when there are already several other warning devices such as headlight, ditchlights, horn, and bell.  Is the beason just considered to be one more component of that mix of warning devices, or it is intended for some specific situation not addressed by the other devices?  </P> <P>How much of the beacon warning function is intended to provide warning at grade crossings?</P>
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