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With its unique technology, the only technology of its kind in the world, the HSG-City grinds underground and urban rails at a speed of 60 km/h. This preventative grinding maintains the rail network and reduces noise emissions by safeguarding against rail defects. By virtue of an innovative safety concept, the HSG-City can be opened and the grinding stones replaced in the safety of the interior of the grinding unit. The accentuated powerful and dynamic design expresses the key characteristics of the machine ‒ performance and speed ‒ in a striking way. The two-dimensional stylistic elements meet the requirements of small series production.