REO has set itself the task of helping to ensure that trains are safer today and in the future. With special chokes for rail technology, we ensure that a safe operation is possible and EMC problems are eliminated at source. The use of a water cooling system allows optimal temperature characteristics to be utilised. In addition, the performance and lifetime of the component is improved. Air chokes are used when a particularly high linearity is required. By its relatively simple structure, they are not only compact, but also very stable.