A railway impact wrench is a power tool designed specifically for loosening and tightening the bolts of a railway track. It is also known as a track wrench, rail wrench, or railroad wrench. The device is used to remove and tighten nut and bolt connections between pieces of rail track, switch stands, and switch rods.

NLB-300 railway construction rail fastener wrench is used for tightening and loosening sleeper bolts, hook-bolt nuts, etc. High power petrol engine ensure large torque and high working efficiency.