Portable rail tamper for track maintenance work ND-1 portable rail tamper is a special machine for ballast tamping on railway lines and turnouts. Choose high-vibration, high-power gasoline engine as power, with high output power and stable. performance. The air compression hammer impact pick is used to impact the ballast. The impact force is large and the tamping effect is good. The whole machine is small in size, light. in. weight, and convenient. to go up and down, which can effectively guarantee driving safety during operation.