Fast Trax HSI Plants The Fast Trax 4240 and 4250 are designed for rock and recycle applications.  Offering the ultimate in portability, you simply drive off of a lowboy trailer and immediately begin crushing up to 400 tph.  Open and closed circuit plant options are available.  Features like a large heavy duty hopper, hand held remote controls, and productive Andreas HSI ensure you ease of operation coupled with reliable production.