Portable Rail Vertical Tamper a special small track maintenance machine for tamping ballast uinder sleepers. Because of its light weight, it can be on and off the track at the same time with the operator. Therefore, the interval between trains can be used for ballast tamping. It is suitable for the maintenance and tamping operation of main line and tumout. SPECIFICATION Model ND-22 Type Rail Tamper Material Stainless Steel Dimensions (L x W x H) (mm) 1077mm 448mm 362mm Engine G5LS Two-stroke petrol Power 2.2 KW Impact frequency 128Hz 138Hz Exciting force 5500N Weight 19 Kg