FIELD: construction of railways. SUBSTANCE: machine has running gear on frame of which members for operation with intermediate rail fastenings and machine step-by-step travel drive are mounted. Step-by-step travel drive has carriage installed on guide secured along running gear frame and shaft with crank connected with hydraulic cylinder also installed on frame. Carriage is connected with shaft by means of additional crank and connecting rod. Drive has also clamp for engagement with head of rail of track along which running gear travels. Clamp has pair of levers to clamp rail head secured on carriage and connected by hydraulic cylinder. Spaces of hydraulic cylinder communicate with delivery or return main line of machine hydraulic control system through two-position four-line hydraulic control valve unit. EFFECT: enlarged operating capabilities. 3 cl, 5 dwg
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