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Electricity has become an integral part of public transport. In the future we will increasingly rely on energy transformation. We are all familiar with means of transport with electric traction (e.g., trains, trams, trolley buses and small rolling stock). Energy needs to be distributed efficiently from high-voltage grids to these applications. An example: in railway infrastructure single-phase low-voltage transformers, like transformer rectifiers by EREA Energy Engineering, are used in substations for energy distribution and signalling, always customised and in line with the standards in place.