NGM-4.4II Internal Combustion Rail Grinding Machine /rail polishing machine is designed for grinding the burr around the thermit welding and the burrbeing generated due to rail wear. The machine can grind rail head and rail side. In the process of operating, the operating frame remains fixedly, just depending the rotation 90° of the petrol engine and the rack, the grinding operation of the rail top and the rail profile can be done. While operating, the handlers don’t use great force and bend down, alleviating labor intensity. The machine body is welded by high quality profile, featuring light weight, easy manipulation. It can be used to do the rough or precision rail profile grinding operation. It’s a dedicated device used to rail head grinding operation in railway maintenance.//Lithium battery powered Rail bolt wrench machine (model: LJ-LDB171X) is composed of host, control system, battery system and rail traveling part. The utility model has the advantages of compact structure, light weight, flexible assembly and disassembly, convenient use and no exhaust emission. It can be transported separately, which is convenient for single person to carry on site. The weight of the separated part is less than 15kg. It is applicable to the laying, maintenance and emergency rescue of railway, and is specialized in various railway bolt operations