Complex sentence: Lubber Run Fill is located on a tangent (straight) section of right-of-way, permitting 70 mph (113 km/hr), and is just east of Wharton Fill and just west of Bradbury Fill.
Split into simpler sentences: Lubber Run Fill supports a tangent (straight) section of right-of-way that permits speeds of 70 mph (113 km/hr). It sits just east of Wharton Fill and just west of Bradbury Fill.