The GM-4.7Ⅱ battery-powered rail grinder is a compact, high-precision solution for urban rail, metro tunnels, and switch zones where traditional grinding trains cannot operate. Weighing only 28 kg and powered by a 7.2kW lithium battery, it delivers consistent, low-noise (≤75 dB) performance without emissions, making it ideal for overnight maintenance in confined or residential areas. Designed for single-operator use, the GM-4.7Ⅱ enables fast setup, efficient weld finishing, and precise rail profile correction — bringing the power of large-scale grinding trains to the last mile of track maintenance.