The HGS rail maintenance module with belt slip technology is comparable with the conventional sanding stone method, but instead, the material removal capacity of a belt head is significantly higher. Through the continuous renewal of the grinding belt, it remains sharp and avoids possible blockage. Grinding is performed in a dry state which makes the accompanying use of water unnecessary. When used regularly, the formation of ridges can be delayed or even prevented. The slip method (belt or stone) cannot replace grinding with rotating stones in case of deep ridges!