Hydraulic rail straightener is a kind of horizontal lines rail for manual hydraulic straightening (or bend) special tools . When used to straight rail hook hook rail head profile, standing up to the other side of the rail head, the piston head and turn the eccentric wheel, the straight rail lock on the rail and tighten the drain valve, insert the crowbar, straight rail operations. Homework finished, unscrew the oil drain valve, piston back, and then reverse rotating eccentric wheel, the straight rail can be looked from the rail.