Kyushu Shinkansen Hakata-Introduced a rail grinder made by ...
In addition, since the surface of the rail can be smoothed, the rail is regularly repaired from the viewpoint of noise control. The Speno rail grinder is a 3-car train with a total length of 38 meters, a weight of 120 tons, a maximum speed of 70 km / h, a working speed of 4 to 6 km / h, and 16 grindstones under the floor to handle the rail head.