... Products include rail cutter, rail grinder, rail drilling machine, track lifting and lining machine, railway ballast tamper, railway bolt wrench, rail bender ... to research and development of new products. The instrument has high degree of intelligence, the function is much, simple operation, ... :1, speed range: 4, 200 km/h2, speed measuring precision: acuities plus or minus 1.5% v3, working voltage range ...